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{{Short description|Group of endocrine diseases characterized by high blood sugar levels}}
{{Redirect|Diabetes}}
{{About|the common insulin disorder|the urine hyper-production disorder|Diabetes insipidus|other uses|Diabetes (disambiguation)}}
{{Infobox disease
{{pp-pc|small=yes}}
| Name=Diabetes mellitus
{{Use American English|date=January 2023}}
| Image=Blue circle for diabetes.svg
{{Infobox medical condition (new)
| Caption=Universal blue circle symbol for diabetes.<ref>{{Cite web|title=Diabetes Blue Circle Symbol|url=http://www.diabetesbluecircle.org|date=17 March 2006|publisher=International Diabetes Federation}}</ref>
| name = Diabetes mellitus
| ICD10={{ICD10|E|10||e|10}}–{{ICD10|E|14||e|10}}
| pronounce = {{IPAc-en|ˌ|d|aɪ|.|ə|'|b|i:|t|i:|z|,_|-|t|I|s}}
| ICD9={{ICD9|250}}
| image = Blue circle for diabetes.svg
| MedlinePlus=001214
| image_size = 250px
| eMedicineSubj=med
| alt = A hollow circle with a thick blue border and a clear centre
| eMedicineTopic=546
| caption = Universal blue circle symbol for diabetes<ref>{{cite web|title=Diabetes Blue Circle Symbol |url=http://www.diabetesbluecircle.org |date=17 March 2006 |publisher=International Diabetes Federation |url-status=dead |archive-url=https://web.archive.org/web/20070805042346/http://www.diabetesbluecircle.org/ |archive-date=5 August 2007 }}</ref>
| eMedicine_mult={{eMedicine2|emerg|134}}
| field = [[Endocrinology]]
| MeshName=Diabetes
| symptoms = {{Plainlist|
| MeshNumber=C18.452.394.750|
* [[polyuria|Frequent urination]]
* [[polydipsia|Increased thirst]]
* [[polyphagia|Increased hunger]]
}}
| complications = {{Plainlist|
* Metabolic imbalances
* Cardiovascular diseases
* Nerve and brain damage
* Kidney failure
* Gastrointestinal changes<ref name="WHO2022">{{cite web |title=Diabetes |url=https://www.who.int/news-room/fact-sheets/detail/diabetes |website=www.who.int |access-date=1 October 2022 |archive-date=26 February 2023 |archive-url=https://web.archive.org/web/20230226173058/https://www.who.int/news-room/fact-sheets/detail/diabetes |url-status=live }}</ref><ref name=ADA2009/><ref>{{cite journal | vauthors = Krishnasamy S, Abell TL | title = Diabetic Gastroparesis: Principles and Current Trends in Management | journal = Diabetes Therapy | volume = 9 | issue = Suppl 1 | pages = 1–42 | date = July 2018 | pmid = 29934758 | pmc = 6028327 | doi = 10.1007/s13300-018-0454-9 |issn=1869-6961}}</ref><ref name=Sa2016>{{cite journal | vauthors = Saedi E, Gheini MR, Faiz F, Arami MA | title = Diabetes mellitus and cognitive impairments | journal = World Journal of Diabetes | volume = 7 | issue = 17 | pages = 412–422 | date = September 2016 | pmid = 27660698 | pmc = 5027005 | doi = 10.4239/wjd.v7.i17.412 | doi-access = free }}</ref>
}}
| duration = Remission may occur, but diabetes is often life-long
| types = {{Plainlist|
* Type 1 diabetes
* Type 2 diabetes
* Gestational diabetes
}}
| causes = Insulin insufficiency or gradual resistance
| risks = {{Plainlist|
* '''Type 1''': [[Heredity|genetics]] and environmental factors<ref name="NIH2014Cause"/>
* '''Type 2''': [[Obesity]], lack of exercise, [[Heredity|genetics]]<ref name="WHO2022"/><ref name="NIH2014Cause">{{cite web|title=Causes of Diabetes – NIDDK|url=http://www.niddk.nih.gov/health-information/health-topics/Diabetes/causes-diabetes/Pages/index.aspx|website=National Institute of Diabetes and Digestive and Kidney Diseases|access-date=10 February 2016|date=June 2014 |url-status=live |archive-date=2 February 2016 |archive-url=https://web.archive.org/web/20160202083725/http://www.niddk.nih.gov/health-information/health-topics/Diabetes/causes-diabetes/Pages/index.aspx }}</ref>
}}
| diagnosis = {{Plainlist|
* High [[blood sugar]]
* Increased [[HbA1c]]<ref name="WHO2022"/>
}}
| differential = [[diabetes insipidus]]
| treatment = {{Plainlist|
* [[Lifestyle causes of type 2 diabetes|Lifestyle changes]]
* [[Diabetes medication]]<ref name="WHO2022"/>
}}
| medication = {{Plainlist|
* [[Insulin (medication)|Insulin]]
* [[Anti-diabetic medication|Anti-hyperglycemics]]<ref name="WHO2022"/><ref name=AFP09/><ref>{{cite web |website=MSDManuals.com |url=https://www.msdmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/drug-treatment-of-diabetes-mellitus |title=Drug Treatment of Diabetes Mellitus |vauthors=Brutsaert EF |date=February 2017 |access-date=12 October 2018 |archive-date=12 October 2018 |archive-url=https://web.archive.org/web/20181012214514/https://www.msdmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/drug-treatment-of-diabetes-mellitus |url-status=live }}</ref>
}}
| frequency = 463 million (5.7%)<ref name="IDF2019">{{cite web |title=IDF DIABETES ATLAS Ninth Edition 2019 |url=https://www.diabetesatlas.org/upload/resources/material/20200302_133351_IDFATLAS9e-final-web.pdf |website=www.diabetesatlas.org |access-date=18 May 2020 |archive-date=1 May 2020 |archive-url=https://web.archive.org/web/20200501123853/https://www.diabetesatlas.org/upload/resources/material/20200302_133351_IDFATLAS9e-final-web.pdf |url-status=live }}</ref>
| deaths = 4.2 million (2019)<ref name=IDF2019/>
}}
}}
'''Diabetes mellitus''', often simply referred to as '''diabetes''', is a group of metabolic diseases in which a person has high [[blood sugar]], either because the body does not produce enough [[insulin]], or because cells do not respond to the insulin that is produced. This high blood sugar produces the classical symptoms of [[polyuria]] (frequent urination), [[polydipsia]] (increased thirst) and [[polyphagia]] (increased hunger).


'''Diabetes mellitus''', often known simply as '''diabetes''', is a group of common [[endocrine disease]]s characterized by sustained [[hyperglycemia|high blood sugar levels]].<ref name=":3">{{Cite web |title=Diabetes |url=https://www.who.int/health-topics/diabetes |url-status=live |access-date=29 January 2023 |website=[[World Health Organization]] |archive-date=29 January 2023 |archive-url=https://web.archive.org/web/20230129101252/https://www.who.int/health-topics/diabetes }}</ref><ref name="msd">{{cite web |title=Diabetes Mellitus (DM) – Hormonal and Metabolic Disorders |url=https://www.msdmanuals.com/en-gb/home/hormonal-and-metabolic-disorders/diabetes-mellitus-dm-and-disorders-of-blood-sugar-metabolism/diabetes-mellitus-dm |website=MSD Manual Consumer Version |access-date=1 October 2022 |archive-date=1 October 2022 |archive-url=https://web.archive.org/web/20221001070047/https://www.msdmanuals.com/en-gb/home/hormonal-and-metabolic-disorders/diabetes-mellitus-dm-and-disorders-of-blood-sugar-metabolism/diabetes-mellitus-dm |url-status=live }}</ref> Diabetes is due to either the [[pancreas]] not producing enough [[insulin]], or the cells of the body becoming unresponsive to the hormone's effects.<ref name="Green2011">{{cite book |veditors=Shoback DG, Gardner D |title=Greenspan's basic & clinical endocrinology|year=2011|publisher=McGraw-Hill Medical|location=New York|isbn=978-0-07-162243-1|chapter=Chapter 17|edition=9th}}</ref> Classic symptoms include thirst, [[polyuria]], weight loss, and [[blurred vision]]. If left untreated, the disease can lead to various health complications, including disorders of the [[Cardiovascular disease|cardiovascular system]], [[Diabetic retinopathy|eye]], [[Diabetic nephropathy|kidney]], and [[Diabetic neuropathy|nerves]].<ref name="ADA2009">{{cite journal |vauthors=Kitabchi AE, Umpierrez GE, Miles JM, Fisher JN |date=July 2009 |title=Hyperglycemic crises in adult patients with diabetes |url=http://care.diabetesjournals.org/content/32/7/1335.full |url-status=live |journal=Diabetes Care |volume=32 |issue=7 |pages=1335–1343 |doi=10.2337/dc09-9032 |pmc=2699725 |pmid=19564476 |archive-url=https://web.archive.org/web/20160625075136/http://care.diabetesjournals.org/content/32/7/1335.full |archive-date=2016-06-25}}</ref> Diabetes accounts for approximately 4.2 million deaths every year,<ref name=IDF2019/> with an estimated 1.5 million caused by either untreated or poorly treated diabetes.<ref name=":3"/>
There are three main types of diabetes:
* [[Diabetes mellitus type 1|Type&nbsp;1 diabetes]]: results from the body's failure to produce insulin, and presently requires the person to inject insulin. (Also referred to as ''insulin-dependent'' diabetes mellitus, ''IDDM'' for short, and ''juvenile'' diabetes.)
* [[Diabetes mellitus type 2|Type&nbsp;2 diabetes]]: results from [[insulin resistance]], a condition in which cells fail to use insulin properly, sometimes combined with an absolute insulin deficiency. (Formerly referred to as ''non-insulin-dependent'' diabetes mellitus, ''NIDDM'' for short, and ''adult-onset'' diabetes.)
* [[Gestational diabetes]]: is when pregnant women, who have never had diabetes before, have a high blood glucose level during pregnancy. It may precede development of type&nbsp;2 DM.


The major types of diabetes are [[Type 1 diabetes|type 1]] and [[Type 2 diabetes|type 2]].<ref name="niddk">{{Cite web|url=https://www.niddk.nih.gov/health-information/diabetes/overview/symptoms-causes|title=Symptoms and Causes of Diabetes|publisher= National Institute of Diabetes and Digestive and Kidney Diseases, US National Institutes of Health|date=2024|accessdate=16 May 2024}}</ref> The most common treatment for type 1 is [[insulin replacement therapy]] (insulin injections), while [[Diabetes medication|anti-diabetic medications]] (such as [[metformin]] and [[semaglutide]]) and [[Lifestyle medicine|lifestyle modifications]] can be used to manage type 2. [[Gestational diabetes]], a form that arises during [[pregnancy]] in some women, normally resolves shortly after delivery.
Other forms of diabetes mellitus include congenital diabetes, which is due to genetic defects of insulin secretion, cystic fibrosis-related diabetes, steroid diabetes induced by high doses of glucocorticoids, and several forms of [[MODY|monogenic diabetes]].


As of 2021, an estimated 537 million people had diabetes worldwide accounting for 10.5% of the adult population, with type 2 making up about 90% of all cases. The [[World Health Organization]] has reported that diabetes was "among the top 10 causes of death in 2021, following a significant percentage increase of 95% since 2000."<ref>{{Cite web |title=The top 10 causes of death |url=https://www.who.int/news-room/fact-sheets/detail/the-top-10-causes-of-death |access-date=2024-08-12 |website=www.who.int |language=en}}</ref> It is estimated that by 2045, approximately 783 million adults, or 1 in 8, will be living with diabetes, representing a 46% increase from the current figures.<ref>{{Cite web |title=Facts & figures |url=https://idf.org/about-diabetes/facts-figures/ |access-date=2023-08-10 |website=International Diabetes Federation |archive-date=2023-08-10 |archive-url=https://web.archive.org/web/20230810231724/https://idf.org/about-diabetes/facts-figures/ |url-status=live }}</ref> The prevalence of the disease continues to increase, most dramatically in low- and middle-income nations.<ref>{{cite journal | vauthors = De Silva AP, De Silva SH, Haniffa R, Liyanage IK, Jayasinghe S, Katulanda P, Wijeratne CN, Wijeratne S, Rajapaksa LC | display-authors = 6 | title = Inequalities in the prevalence of diabetes mellitus and its risk factors in Sri Lanka: a lower middle income country | journal = International Journal for Equity in Health | volume = 17 | issue = 1 | pages = 45 | date = April 2018 | pmid = 29665834 | pmc = 5905173 | doi = 10.1186/s12939-018-0759-3 | doi-access = free }}</ref> Rates are similar in women and men, with diabetes being the seventh leading cause of death globally.<ref name="Vos2012" /><ref>{{cite web |title=The top 10 causes of death |url=https://www.who.int/news-room/fact-sheets/detail/the-top-10-causes-of-death |website=www.who.int |access-date=18 May 2020 |archive-date=24 September 2021 |archive-url=https://web.archive.org/web/20210924191646/https://www.who.int/news-room/fact-sheets/detail/the-top-10-causes-of-death |url-status=live }}</ref> The global expenditure on diabetes-related healthcare is an estimated US$760 billion a year.<ref>{{cite journal | vauthors = Bommer C, Sagalova V, Heesemann E, Manne-Goehler J, Atun R, Bärnighausen T, Davies J, Vollmer S | display-authors = 6 | title = Global Economic Burden of Diabetes in Adults: Projections From 2015 to 2030 | journal = Diabetes Care | volume = 41 | issue = 5 | pages = 963–970 | date = May 2018 | pmid = 29475843 | doi = 10.2337/dc17-1962 | s2cid = 3538441 | doi-access = free }}</ref>
All forms of diabetes have been treatable since [[insulin]] became available in 1921, and type 2 diabetes may be controlled with medications. Both type 1 and 2 are [[chronic]] conditions that usually cannot be cured. [[Pancreas transplant]]s have been tried with limited success in type&nbsp;1 DM; [[gastric bypass surgery]] has been successful in many with [[morbid obesity]] and type&nbsp;2 DM. Gestational diabetes usually resolves after delivery. Diabetes without proper treatments can cause many complications. [[Acute (medical)|Acute]] complications include [[hypoglycemia]], [[diabetic ketoacidosis]], or [[nonketotic hyperosmolar coma]]. Serious long-term complications include [[cardiovascular disease]], [[chronic renal failure]], [[diabetic retinopathy|retinal damage]]. Adequate treatment of diabetes is thus important, as well as [[blood pressure]] control and lifestyle factors such as [[tobacco smoking|smoking]] cessation and maintaining a healthy [[human weight|body weight]].
{{TOC limit}}


==Signs and symptoms==
As of 2000 at least 171 million people worldwide suffer from diabetes, or 2.8% of the population.<ref name="Wild2004">{{Cite journal|author=Wild S, Roglic G, Green A, Sicree R, King H |title=Global prevalence of diabetes: estimates for 2000 and projections for 2030 |journal=Diabetes Care |volume=27 |issue=5 |pages=1047–53 |year=2004 |month=May |pmid=15111519 |doi=10.2337/diacare.27.5.1047}}</ref> Type 2 diabetes is by far the most common, affecting 90 to 95% of the U.S. diabetes population.<ref name="bare_url">{{Cite web|title=Type 2 Diabetes Overview|url=http://diabetes.webmd.com/guide/type-2-diabetes|publisher=Web MD}}</ref>
[[File:Main symptoms of diabetes.svg|thumb|upright=1.5|Overview of the most significant symptoms of diabetes]] [[File:Diabetes complications.jpg|thumb|Retinopathy, nephropathy, and neuropathy are potential complications of diabetes]]The classic symptoms of untreated diabetes are [[polyuria]], thirst, and weight loss.<ref name=":5">{{Cite book |last1=Feather |first1=Adam |title=Kumar and Clark's Clinical Medicine |last2=Randall |first2=David |last3=Waterhouse |first3=Mona |publisher=[[Elsevier]] |year=2021 |isbn=978-0-7020-7868-2 |edition=10th |pages=699–741}}</ref> Several other non-specific signs and symptoms may also occur, including fatigue, blurred vision, sweet smelling urine/semen and genital itchiness due to [[Candidiasis|''Candida'' infection]].<ref name=":5" /> About half of affected individuals may also be asymptomatic.<ref name=":5" /> Type 1 presents abruptly following a pre-clinical phase, while type 2 has a more insidious onset; patients may remain asymptomatic for many years.<ref>{{Cite book |last1=Goldman |first1=Lee |title=Goldman-Cecil Medicine |last2=Schafer |first2=Andrew |publisher=[[Elsevier]] |year=2020 |isbn=978-0-323-53266-2 |edition=26th |pages=1490–1510}}</ref>


[[Diabetic ketoacidosis]] is a medical emergency that occurs most commonly in type 1, but may also occur in type 2 if it has been longstanding or if the individual has significant β-cell dysfunction.<ref name=":6">{{Cite book |last1=Penman |first1=Ian |title=Davidson's Principles and Practice of Medicine |last2=Ralston |first2=Stuart |last3=Strachan |first3=Mark |last4=Hobson |first4=Richard |publisher=Elsevier |year=2023 |isbn=978-0-7020-8348-8 |edition=24th |pages=703–753}}</ref> Excessive production of [[ketone bodies]] leads to signs and symptoms including nausea, vomiting, abdominal pain, the smell of [[acetone]] in the breath, deep breathing known as [[Kussmaul breathing]], and in severe cases [[Altered level of consciousness|decreased level of consciousness]].<ref name=":6" /> [[Hyperosmolar hyperglycemic state]] is another emergency characterized by dehydration secondary to severe hyperglycemia, with resultant [[hypernatremia]] leading to an altered mental state and possibly [[coma]].<ref>{{Cite journal |last1=Willix |first1=Clare |last2=Griffiths |first2=Emma |last3=Singleton |first3=Sally |date=May 2019 |title=Hyperglycaemic presentations in type 2 diabetes |url=https://www1.racgp.org.au/ajgp/2019/may/hyperglycaemic-presentations-in-type-2-diabetes |journal=Australian Journal of General Practice |volume=48 |issue=5 |pages=263–267 |doi=10.31128/AJGP-12-18-4785 |pmid=31129935 |s2cid=167207067 |doi-access=free |access-date=2023-08-10 |archive-date=2023-08-10 |archive-url=https://web.archive.org/web/20230810230515/https://www1.racgp.org.au/ajgp/2019/may/hyperglycaemic-presentations-in-type-2-diabetes |url-status=live }}</ref>
==Classification==
Most cases of diabetes mellitus fall into three broad categories: [[Diabetes mellitus type 1|type&nbsp;1]], [[Diabetes mellitus type 2|type&nbsp;2]], and [[gestational diabetes]]. A few other types are described. The term ''diabetes'', without qualification, usually refers to diabetes ''mellitus''. The rare disease [[diabetes insipidus]] has similar symptoms as diabetes mellitus, but without disturbances in the sugar metabolism (insipidus meaning "without taste" in Latin).


[[Hypoglycemia]] is a recognized complication of insulin treatment used in diabetes.<ref name=":7">{{Cite journal |last=Amiel |first=Stephanie A. |date=2021-05-01 |title=The consequences of hypoglycaemia |url=https://doi.org/10.1007/s00125-020-05366-3 |journal=Diabetologia |volume=64 |issue=5 |pages=963–970 |doi=10.1007/s00125-020-05366-3 |issn=1432-0428 |pmc=8012317 |pmid=33550443}}</ref> An acute presentation can include mild symptoms such as [[Perspiration|sweating]], trembling, and [[palpitations]], to more serious effects including [[Delirium|impaired cognition]], confusion, [[seizure]]s, [[coma]], and rarely death.<ref name=":7" /> Recurrent hypoglycemic episodes may lower the glycemic threshold at which symptoms occur, meaning mild symptoms may not appear before cognitive deterioration begins to occur.<ref name=":7" />
{|class="wikitable" align="right"

!colspan=3 | Comparison of type 1 and 2 diabetes
===Long-term complications===
{{Main|Complications of diabetes}}
The major long-term complications of diabetes relate to damage to [[blood vessel]]s at both [[Macrovascular disease|macrovascular]] and [[Microvascular disease|microvascular]] levels.<ref name=":8">{{Cite web |last= |first= |title=Diabetes – long-term effects |url=http://www.betterhealth.vic.gov.au/health/conditionsandtreatments/diabetes-long-term-effects |access-date=2023-08-12 |website=Better Health Channel |publisher=Department of Health |publication-place=Victoria |archive-date=2023-10-29 |archive-url=https://web.archive.org/web/20231029233716/https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/diabetes-long-term-effects |url-status=live }}</ref><ref>{{cite journal | vauthors = Sarwar N, Gao P, Seshasai SR, Gobin R, Kaptoge S, Di Angelantonio E, Ingelsson E, Lawlor DA, Selvin E, Stampfer M, Stehouwer CD, Lewington S, Pennells L, Thompson A, Sattar N, White IR, Ray KK, Danesh J | display-authors = 6 | title = Diabetes mellitus, fasting blood glucose concentration, and risk of vascular disease: a collaborative meta-analysis of 102 prospective studies | journal = Lancet | volume = 375 | issue = 9733 | pages = 2215–2222 | date = June 2010 | pmid = 20609967 | pmc = 2904878 | doi = 10.1016/S0140-6736(10)60484-9 }}</ref> Diabetes doubles the risk of [[cardiovascular disease]], and about 75% of deaths in people with diabetes are due to [[coronary artery disease]].<ref>{{cite journal |display-authors=6 |vauthors=O'Gara PT, Kushner FG, Ascheim DD, Casey DE, Chung MK, de Lemos JA, Ettinger SM, Fang JC, Fesmire FM, Franklin BA, Granger CB, Krumholz HM, Linderbaum JA, Morrow DA, Newby LK, Ornato JP, Ou N, Radford MJ, Tamis-Holland JE, Tommaso CL, Tracy CM, Woo YJ, Zhao DX, Anderson JL, Jacobs AK, Halperin JL, Albert NM, Brindis RG, Creager MA, DeMets D, Guyton RA, Hochman JS, Kovacs RJ, Kushner FG, Ohman EM, Stevenson WG, Yancy CW |date=January 2013 |title=2013 ACCF/AHA guideline for the management of ST-elevation myocardial infarction: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines |journal=Circulation |volume=127 |issue=4 |pages=e368 |doi=10.1161/CIR.0b013e3182742cf6 |pmid=23247304 |doi-access=free}}</ref> Other macrovascular morbidities include [[stroke]] and [[peripheral artery disease]].<ref>{{cite journal |vauthors=Papatheodorou K, Banach M, Bekiari E, Rizzo M, Edmonds M |date=11 March 2018 |title=Complications of Diabetes 2017 |journal=Journal of Diabetes Research |volume=2018 |pages=3086167 |doi=10.1155/2018/3086167 |pmc=5866895 |pmid=29713648 |doi-access=free}}</ref>

Microvascular disease affects the [[eye]]s, [[kidney]]s, and [[nerve]]s.<ref name=":8" /> Damage to the retina, known as [[diabetic retinopathy]], is the most common cause of blindness in people of working age.<ref name=":5" /> The eyes can also be affected in other ways, including development of [[cataract]] and [[glaucoma]].<ref name=":5" /> It is recommended that people with diabetes visit an [[optometrist]] or [[ophthalmologist]] once a year.<ref>{{Cite web |title=Diabetes eye care |url=https://medlineplus.gov/ency/patientinstructions/000078.htm |access-date=2018-03-27 |website=MedlinePlus |publisher=National Library of Medicine |publication-place=Maryland |archive-date=2018-03-28 |archive-url=https://web.archive.org/web/20180328102348/https://medlineplus.gov/ency/patientinstructions/000078.htm |url-status=live }}</ref>

[[Diabetic nephropathy]] is a major cause of [[chronic kidney disease]], accounting for over 50% of patients on [[Kidney dialysis|dialysis]] in the United States.<ref name=":9">{{Cite book |last1=Wing |first1=Edward J |title=Cecil Essentials of Medicine |last2=Schiffman |first2=Fred |publisher=[[Elsevier]] |year=2022 |isbn=978-0-323-72271-1 |edition=10th |location=Pennsylvania |pages=282–297, 662–677}}</ref> [[Diabetic neuropathy]], damage to nerves, manifests in various ways, including [[sensory loss]], [[neuropathic pain]], and [[autonomic dysfunction]] (such as [[Orthostatic hypotension|postural hypotension]], [[Diarrhea|diarrhoea]], and [[erectile dysfunction]]).<ref name=":5" /> Loss of pain sensation predisposes to trauma that can lead to [[Diabetic foot|diabetic foot problems]] (such as [[ulcer]]ation), the most common cause of non-traumatic lower-limb [[amputation]].<ref name=":5" />

[[Hearing loss in diabetes|Hearing loss]] is another long-term complication associated with diabetes.<ref>{{cite journal |title=A systematic review of the association of Type I diabetes with sensorineural hearing loss |first1=Rahul |last1=Mittal |first2=Keelin |last2=McKenna |first3=Grant |last3=Keith |first4=Joana R. N. |last4=Lemos |first5=Jeenu |last5=Mittal |first6=Khemraj |last6=Hirani |journal=[[PLOS One]] |date=9 February 2024 |volume=19 |issue=2 |pages=e0298457 |doi=10.1371/journal.pone.0298457|doi-access=free |pmid=38335215 |bibcode=2024PLoSO..1998457M |pmc=10857576 }}</ref>

Based on extensive data and numerous cases of gallstone disease, it appears that a causal link might exist between type 2 diabetes and gallstones. People with diabetes are at a higher risk of developing gallstones compared to those without diabetes.<ref>{{Cite journal |last1=Yuan |first1=Shuai |last2=Gill |first2=Dipender |last3=Giovannucci |first3=Edward L. |last4=Larsson |first4=Susanna C. |date=March 2022 |title=Obesity, Type 2 Diabetes, Lifestyle Factors, and Risk of Gallstone Disease: A Mendelian Randomization Investigation |journal=Clinical Gastroenterology and Hepatology |volume=20 |issue=3 |pages=e529–e537 |doi=10.1016/j.cgh.2020.12.034|pmid=33418132 |doi-access=free |hdl=10044/1/86461 |hdl-access=free }}</ref>

There is a link between [[cognitive deficit]] and diabetes; studies have shown that diabetic individuals are at a greater risk of cognitive decline, and have a greater rate of decline compared to those without the disease.<ref name="cognitive">{{cite journal |vauthors=Cukierman T, Gerstein HC, Williamson JD |date=December 2005 |title=Cognitive decline and dementia in diabetes—systematic overview of prospective observational studies |journal=Diabetologia |volume=48 |issue=12 |pages=2460–2469 |doi=10.1007/s00125-005-0023-4 |pmid=16283246 |doi-access=free}}</ref> The condition also predisposes to [[Falls in older adults|falls in the elderly]], especially those treated with [[insulin]].<ref>{{cite journal |vauthors=Yang Y, Hu X, Zhang Q, Zou R |date=November 2016 |title=Diabetes mellitus and risk of falls in older adults: a systematic review and meta-analysis |journal=Age and Ageing |volume=45 |issue=6 |pages=761–767 |doi=10.1093/ageing/afw140 |pmid=27515679 |doi-access=free}}</ref>

==Causes==
{| class="wikitable" style="float:right; margin:10px"
|+Comparison of type 1 and 2 diabetes<ref name=Will2011>{{cite book |title=Williams textbook of endocrinology |publisher=Elsevier/Saunders |isbn=978-1-4377-0324-5 |pages=1371–1435 |edition=12th|year=2011 }}</ref>
|-
|-
! Feature !! [[Type 1 diabetes]] !! [[Type 2 diabetes]]
! Feature !! Type 1 diabetes !! Type 2 diabetes
|-
|-
! Onset
! Onset
| Sudden||Gradual
| Sudden<ref name=agabegi2nd>{{cite book |author=Elizabeth D Agabegi; Agabegi, Steven S. |title=Step-Up to Medicine (Step-Up Series) |publisher=Lippincott Williams & Wilkins |location=Hagerstwon, MD |year=2008 |pages= |isbn=0-7817-7153-6 |doi= |accessdate=}}</ref> || Gradual<ref name=agabegi2nd/>
|-
|-
! Age at onset
! Age at onset
| Any age; average age at diagnosis being 24.<ref>{{cite web |url=https://www.usnews.com/news/health-news/articles/2023-09-28/over-a-third-of-adults-with-type-1-diabetes-werent-diagnosed-until-after-30 |title=Over a Third of Adults With Type 1 Diabetes Weren't Diagnosed Until After 30 |work=U.S. News & World Report |date=28 September 2023 |access-date=3 June 2024}}</ref> || Mostly in adults
| Any age <br>(mostly young)<ref name=agabegi2nd/> || Mostly in adults
|-
|-
! Body habitus
! Body size
| Thin<ref name=agabegi2nd/> or normal<ref>{{cite doi|10.1383/medc.30.1.1.28264}}</ref> || Often [[obese]]<ref name=agabegi2nd/>
| Thin or normal<ref>{{cite journal |vauthors=Lambert P, Bingley PJ | title = What is Type 1 Diabetes? | journal = Medicine | volume = 30 | pages = 1–5 | year = 2002 | doi = 10.1383/medc.30.1.1.28264 }}</ref> || Often [[obese]]
|-
|-
! [[diabetic ketoacidosis|Ketoacidosis]]
! [[diabetic ketoacidosis|Ketoacidosis]]
| Common<ref name=agabegi2nd/> || Rare<ref name=agabegi2nd/>
| Common || Rare
|-
|-
! [[Autoantibodies]]
! [[Autoantibodies]]
| Usually present<ref name=agabegi2nd/> || Absent<ref name=agabegi2nd/>
| Usually present || Absent
|-
|-
! Endogenous insulin
! Endogenous insulin
| Low or absent<ref name=agabegi2nd/> || Normal, decreased<br> or increased<ref name=agabegi2nd/>
| Low or absent || Normal, decreased<br /> or increased
|-
|-
! Heritability
! [[Concordance (genetics)|Concordance]] <br>in [[identical twin]]s
| 0.69 to 0.88<ref>{{cite journal | vauthors = Skov J, Eriksson D, Kuja-Halkola R, Höijer J, Gudbjörnsdottir S, Svensson AM, Magnusson PK, Ludvigsson JF, Kämpe O, Bensing S | display-authors = 6 | title = Co-aggregation and heritability of organ-specific autoimmunity: a population-based twin study | journal = European Journal of Endocrinology | volume = 182 | issue = 5 | pages = 473–480 | date = May 2020 | pmid = 32229696 | doi = 10.1530/EJE-20-0049 | pmc = 7182094 }}</ref><ref>{{cite journal | vauthors = Hyttinen V, Kaprio J, Kinnunen L, Koskenvuo M, Tuomilehto J | title = Genetic liability of type 1 diabetes and the onset age among 22,650 young Finnish twin pairs: a nationwide follow-up study | journal = Diabetes | volume = 52 | issue = 4 | pages = 1052–1055 | date = April 2003 | pmid = 12663480 | doi = 10.2337/diabetes.52.4.1052 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Condon J, Shaw JE, Luciano M, Kyvik KO, Martin NG, Duffy DL | title = A study of diabetes mellitus within a large sample of Australian twins | journal = Twin Research and Human Genetics | volume = 11 | issue = 1 | pages = 28–40 | date = February 2008 | pmid = 18251672 | doi = 10.1375/twin.11.1.28 | s2cid = 18072879 | url = https://www.pure.ed.ac.uk/ws/files/11913813/study_of_diabetes_mellitus_within_a_large_sample_of_Australian_twins.pdf | access-date = 2021-12-27 | archive-date = 2023-07-01 | archive-url = https://web.archive.org/web/20230701154034/https://www.pure.ed.ac.uk/ws/files/11913813/study_of_diabetes_mellitus_within_a_large_sample_of_Australian_twins.pdf | url-status = live }}</ref>|| 0.47 to 0.77<ref>{{cite journal | vauthors = Willemsen G, Ward KJ, Bell CG, Christensen K, Bowden J, Dalgård C, Harris JR, Kaprio J, Lyle R, Magnusson PK, Mather KA, Ordoňana JR, Perez-Riquelme F, Pedersen NL, Pietiläinen KH, Sachdev PS, Boomsma DI, Spector T | display-authors = 6 | title = The Concordance and Heritability of Type 2 Diabetes in 34,166 Twin Pairs From International Twin Registers: The Discordant Twin (DISCOTWIN) Consortium | journal = Twin Research and Human Genetics | volume = 18 | issue = 6 | pages = 762–771 | date = December 2015 | pmid = 26678054 | doi = 10.1017/thg.2015.83 | s2cid = 17854531 | doi-access = free }}</ref>
| 50%<ref name=agabegi2nd/> || 90%<ref name=agabegi2nd/>
|-
|-
! Prevalence
! Prevalence
(age standardized)
| Less prevalent || More prevalent<br> - 90 to 95% of<br>&nbsp; U.S. diabetics<ref name="bare_url" />
| <2 per 1,000<ref>{{cite journal | vauthors = Lin X, Xu Y, Pan X, Xu J, Ding Y, Sun X, Song X, Ren Y, Shan PF | display-authors = 6 | title = Global, regional, and national burden and trend of diabetes in 195 countries and territories: an analysis from 1990 to 2025 | journal = Scientific Reports | volume = 10 | issue = 1 | pages = 14790 | date = September 2020 | pmid = 32901098 | doi = 10.1038/s41598-020-71908-9 | pmc = 7478957 | bibcode = 2020NatSR..1014790L }}</ref>|| ~6% (men), ~5% (women)<ref>{{cite journal | vauthors = Tinajero MG, Malik VS | title = An Update on the Epidemiology of Type 2 Diabetes: A Global Perspective | journal = Endocrinology and Metabolism Clinics of North America | volume = 50 | issue = 3 | pages = 337–355 | date = September 2021 | pmid = 34399949 | doi = 10.1016/j.ecl.2021.05.013 }}</ref>
|}
|}


Diabetes is classified by the [[World Health Organization]] into six categories: [[type 1 diabetes]], [[type 2 diabetes]], hybrid forms of diabetes (including [[Latent autoimmune diabetes of adults|slowly evolving, immune-mediated diabetes of adults]] and [[Ketosis-prone diabetes|ketosis-prone type 2 diabetes]]), hyperglycemia first detected during pregnancy, "other specific types", and "unclassified diabetes".<ref>{{Cite report |url=https://apps.who.int/iris/rest/bitstreams/1233344/retrieve |title=Classification of diabetes mellitus 2019 |date=2019 |publisher=World Health Organisation |location=Geneva |isbn=978-92-4-151570-2 |access-date=2023-08-15 |archive-date=2023-03-06 |archive-url=https://web.archive.org/web/20230306070305/https://apps.who.int/iris/rest/bitstreams/1233344/retrieve |url-status=live }}</ref> Diabetes is a more variable disease than once thought, and individuals may have a combination of forms.<ref name="Tuomi2014">{{cite journal |vauthors=Tuomi T, Santoro N, Caprio S, Cai M, Weng J, Groop L |date=March 2014 |title=The many faces of diabetes: a disease with increasing heterogeneity |journal=Lancet |volume=383 |issue=9922 |pages=1084–1094 |doi=10.1016/S0140-6736(13)62219-9 |pmid=24315621 |s2cid=12679248}}</ref>
The term "type&nbsp;1 diabetes" has replaced several former terms, including childhood-onset diabetes, juvenile diabetes, and insulin-dependent diabetes mellitus (IDDM). Likewise, the term "type&nbsp;2 diabetes" has replaced several former terms, including adult-onset diabetes, obesity-related diabetes, and non-insulin-dependent diabetes mellitus (NIDDM). Beyond these two types, there is no agreed-upon standard nomenclature. Various sources have defined "type&nbsp;3 diabetes" as: [[gestational diabetes]],<ref>{{Cite web|url= http://www.diabetes.org/other-types.jsp|title=Other "types" of diabetes|publisher=[[American Diabetes Association]]|date=August 25, 2005}}</ref> insulin-resistant type&nbsp;1 diabetes (or "double diabetes"), type&nbsp;2 diabetes which has progressed to require injected insulin, and [[latent autoimmune diabetes]] of adults (or LADA or "[[Diabetes Type 1.5|type&nbsp;1.5]]" diabetes).<ref>{{Cite web|url=http://autoimmune.pathology.jhmi.edu/diseases.cfm?systemID=3&DiseaseID=23|title=Diseases: Johns Hopkins Autoimmune Disease Research Center|accessdate=2007-09-23|work=}}</ref>


===Type 1 diabetes===
===Type 1===
{{Main|Diabetes mellitus type 1}}
{{Main|Type 1 diabetes}}
Type 1 diabetes mellitus is characterized by loss of the insulin-producing [[beta cell]]s of the [[islets of Langerhans]] in the pancreas leading to insulin deficiency. This type of diabetes can be further classified as immune-mediated or idiopathic. The majority of type&nbsp;1 diabetes is of the immune-mediated nature, where beta cell loss is a [[T-cell]] mediated [[autoimmunity|autoimmune]] attack.<ref name="Rother">{{Cite journal|author=Rother KI |title=Diabetes treatment—bridging the divide |journal=The New England Journal of Medicine |volume=356 |issue=15 |pages=1499–501 |year=2007 |month=April |pmid=17429082 |doi=10.1056/NEJMp078030}}</ref> There is no known preventive measure against type&nbsp;1 diabetes, which causes approximately 10% of diabetes mellitus cases in North America and Europe. Most affected people are otherwise healthy and of a healthy weight when onset occurs. Sensitivity and responsiveness to insulin are usually normal, especially in the early stages. Type&nbsp;1 diabetes can affect children or adults but was traditionally termed "juvenile diabetes" because it represents a majority of the diabetes cases in children.
Type 1 accounts for 5 to 10% of diabetes cases and is the most common type diagnosed in patients under 20 years;<ref name=":10">{{Cite book |last1=Kumar |first1=V |title=Robbins & Cotran Pathologic Basis of Disease |last2=Abbas |first2=A |last3=Aster |first3=J |publisher=[[Elsevier]] |year=2021 |isbn=978-0-323-60992-0 |edition=10th |location=Pennsylvania |pages=1065–1132}}</ref> however, the older term "juvenile-onset diabetes" is no longer used as onset in adulthood is not unusual.<ref name=":9" /> The disease is characterized by loss of the insulin-producing [[beta cell]]s of the [[pancreatic islets]], leading to severe insulin deficiency, and can be further classified as [[immune-mediated]] or [[Idiopathic disease|idiopathic]] (without known cause).<ref name=":10" /> The majority of cases are immune-mediated, in which a [[T cell]]-mediated [[autoimmunity|autoimmune]] attack causes loss of beta cells and thus insulin deficiency.<ref name="Rother">{{cite journal | vauthors = Rother KI | title = Diabetes treatment—bridging the divide | journal = The New England Journal of Medicine | volume = 356 | issue = 15 | pages = 1499–1501 | date = April 2007 | pmid = 17429082 | pmc = 4152979 | doi = 10.1056/NEJMp078030 }}</ref> Patients often have irregular and unpredictable blood sugar levels due to very low insulin and an impaired counter-response to hypoglycemia.<ref name="merck1">{{cite web |last=Brutsaert |first=EF |date=September 2022 |title=Diabetes Mellitus (DM) |url=https://www.msdmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/diabetes-mellitus-dm |access-date=2023-08-15 |website=MSD Manual Professional Version |publisher=[[Merck & Co.|Merck Publishing]] |archive-date=2023-08-15 |archive-url=https://web.archive.org/web/20230815124233/https://www.msdmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/diabetes-mellitus-dm |url-status=live }}</ref> [[File:Type 1 Diabetes Mellitus.jpg|thumb|Autoimmune attack in type 1 diabetes.]]
Type&nbsp;1 diabetes is partly [[Genetic disorder|inherited]], with multiple genes, including certain [[Human leukocyte antigen|HLA genotypes]], known to influence the risk of diabetes. In genetically susceptible people, the onset of diabetes can be triggered by one or more [[environmental factor]]s,<ref name=PetzoldSolimena2015>{{cite journal | vauthors = Petzold A, Solimena M, Knoch KP | title = Mechanisms of Beta Cell Dysfunction Associated With Viral Infection | journal = Current Diabetes Reports | volume = 15 | issue = 10 | pages = 73 | date = October 2015 | pmid = 26280364 | pmc = 4539350 | doi = 10.1007/s11892-015-0654-x | type = Review | quote = So far, none of the hypotheses accounting for virus-induced beta cell autoimmunity has been supported by stringent evidence in humans, and the involvement of several mechanisms rather than just one is also plausible. }}</ref> such as a [[viral infection]] or diet. Several viruses have been implicated, but to date there is no stringent evidence to support this hypothesis in humans.<ref name=PetzoldSolimena2015 /><ref name=ButaliaKaplan2016>{{cite journal | vauthors = Butalia S, Kaplan GG, Khokhar B, Rabi DM | title = Environmental Risk Factors and Type 1 Diabetes: Past, Present, and Future | journal = Canadian Journal of Diabetes | volume = 40 | issue = 6 | pages = 586–593 | date = December 2016 | pmid = 27545597 | doi = 10.1016/j.jcjd.2016.05.002 | type = Review }}</ref>


Type 1 diabetes can occur at any age, and a significant proportion is diagnosed during adulthood. [[Latent autoimmune diabetes of adults]] (LADA) is the diagnostic term applied when type 1 diabetes develops in adults; it has a slower onset than the same condition in children. Given this difference, some use the unofficial term "type 1.5 diabetes" for this condition. Adults with LADA are frequently initially misdiagnosed as having type 2 diabetes, based on age rather than a cause.<ref>{{cite journal | vauthors = Laugesen E, Østergaard JA, Leslie RD | title = Latent autoimmune diabetes of the adult: current knowledge and uncertainty | journal = Diabetic Medicine | volume = 32 | issue = 7 | pages = 843–852 | date = July 2015 | pmid = 25601320 | pmc = 4676295 | doi = 10.1111/dme.12700 }}</ref> LADA leaves adults with higher levels of insulin production than type 1 diabetes, but not enough insulin production for healthy blood sugar levels.<ref>{{Cite web |title=What Is Diabetes? |url=https://www.diabetesdaily.com/learn-about-diabetes/basics/what-is-diabetes/ |access-date=2023-09-10 |website=Diabetes Daily |archive-date=2023-10-04 |archive-url=https://web.archive.org/web/20231004071449/https://www.diabetesdaily.com/learn-about-diabetes/basics/what-is-diabetes/ |url-status=live }}</ref><ref>{{Cite journal |last1=Nolasco-Rosales |first1=Germán Alberto |last2=Ramírez-González |first2=Dania |last3=Rodríguez-Sánchez |first3=Ester |last4=Ávila-Fernandez |first4=Ángela |last5=Villar-Juarez |first5=Guillermo Efrén |last6=González-Castro |first6=Thelma Beatriz |last7=Tovilla-Zárate |first7=Carlos Alfonso |last8=Guzmán-Priego |first8=Crystell Guadalupe |last9=Genis-Mendoza |first9=Alma Delia |last10=Ble-Castillo |first10=Jorge Luis |last11=Marín-Medina |first11=Alejandro |last12=Juárez-Rojop |first12=Isela Esther |date=2023-04-29 |title=Identification and phenotypic characterization of patients with LADA in a population of southeast Mexico |journal=Scientific Reports |volume=13 |issue=1 |pages=7029 |doi=10.1038/s41598-023-34171-2 |issn=2045-2322 |pmid=37120620|pmc=10148806 |bibcode=2023NatSR..13.7029N }}</ref>
Brittle diabetes, also known as unstable diabetes or labile diabetes, refers to a type of [[insulin]]-dependent [[diabetes]] characterized by dramatic and recurrent swings in [[glucose]] levels, often occurring for no apparent reason.<ref>{{cite web|url=http://www.merck.com/mmpe/sec12/ch158/ch158b.html#sec12-ch158-ch158b-1206 |title=Diabetes Mellitus (DM): Diabetes Mellitus and Disorders of Carbohydrate Metabolism: Merck Manual Professional |publisher=Merck.com |date= |accessdate=2010-07-30}}</ref> The result can be irregular and unpredictable [[hyperglycemia]]s, frequently with [[ketosis]], and sometimes serious [[hypoglycemia]]s. Brittle diabetes occurs no more frequently than in 1% to 2% of diabetics.<ref name="pmid406527">{{cite journal |author=Dorner M, Pinget M, Brogard JM |title=Essential labile diabetes |language=German |journal=MMW Munch Med Wochenschr |volume=119 |issue=19 |pages=671–4 |year=1977 |month=May |pmid=406527}}</ref>


===Type 2 diabetes===
===Type 2===
{{Main|Diabetes mellitus type 2}}
{{Main|Type 2 diabetes}}
[[File:Type 2 Diabetes Mellitus.jpg|thumb|Reduced insulin secretion or weaker effect of insulin on its receptor leads to high glucose content in the blood.]]
Type&nbsp;2 diabetes mellitus is characterized by [[insulin resistance]] which may be combined with relatively reduced insulin secretion. The defective responsiveness of body tissues to insulin is believed to involve the [[insulin receptor]]. However, the specific defects are not known. Diabetes mellitus due to a known defect are classified separately. Type&nbsp;2 diabetes is the most common type.
Type 2 diabetes is characterized by [[insulin resistance]], which may be combined with relatively reduced insulin secretion.<ref name=Green2011/> The defective responsiveness of body tissues to insulin is believed to involve the [[insulin receptor]].<ref>{{Citation |last1=Freeman |first1=Andrew M. |title=Insulin Resistance |date=2024 |work=StatPearls |url=http://www.ncbi.nlm.nih.gov/books/NBK507839/ |access-date=2024-02-13 |place=Treasure Island (FL) |publisher=StatPearls Publishing |pmid=29939616 |last2=Acevedo |first2=Luis A. |last3=Pennings |first3=Nicholas |archive-date=2024-02-07 |archive-url=https://web.archive.org/web/20240207020904/https://www.ncbi.nlm.nih.gov/books/NBK507839/ |url-status=live }}</ref> However, the specific defects are not known. Diabetes mellitus cases due to a known defect are classified separately. Type 2 diabetes is the most common type of diabetes mellitus accounting for 95% of diabetes.<ref name="WHO2022"/> Many people with type 2 diabetes have evidence of [[prediabetes]] (impaired fasting glucose and/or impaired glucose tolerance) before meeting the criteria for type 2 diabetes.<ref>{{cite journal | author = American Diabetes Association | title = 2. Classification and Diagnosis of Diabetes | journal = Diabetes Care | volume = 40 | issue = Suppl 1 | pages = S11–S24 | date = January 2017 | pmid = 27979889 | doi = 10.2337/dc17-S005 | doi-access = free }}</ref> The progression of prediabetes to overt type 2 diabetes can be slowed or reversed by lifestyle changes or [[Anti-diabetic drug|medications]] that improve insulin sensitivity or reduce the [[Glycogenolysis|liver's glucose production]].<ref name="pmid30528418">{{cite journal | vauthors = Carris NW, Magness RR, Labovitz AJ | title = Prevention of Diabetes Mellitus in Patients With Prediabetes | journal = The American Journal of Cardiology | volume = 123 | issue = 3 | pages = 507–512 | date = February 2019 | pmid = 30528418 | pmc = 6350898 | doi = 10.1016/j.amjcard.2018.10.032 }}</ref>


Type 2 diabetes is primarily due to lifestyle factors and genetics.<ref name=Fat2009>{{cite journal | vauthors = Risérus U, Willett WC, Hu FB | title = Dietary fats and prevention of type 2 diabetes | journal = Progress in Lipid Research | volume = 48 | issue = 1 | pages = 44–51 | date = January 2009 | pmid = 19032965 | pmc = 2654180 | doi = 10.1016/j.plipres.2008.10.002 }}</ref> A number of lifestyle factors are known to be important to the development of type 2 diabetes, including [[obesity]] (defined by a [[body mass index]] of greater than 30), lack of [[physical activity]], poor [[Diet (nutrition)|diet]], [[stress (biology)|stress]], and [[urbanization]].<ref name=Will2011/><ref>{{Cite journal |last1=Fletcher |first1=Barbara |last2=Gulanick |first2=Meg |last3=Lamendola |first3=Cindy |date=January 2002 |title=Risk factors for type 2 diabetes mellitus |url=https://pubmed.ncbi.nlm.nih.gov/11800065 |journal=The Journal of Cardiovascular Nursing |volume=16 |issue=2 |pages=17–23 |doi=10.1097/00005082-200201000-00003 |issn=0889-4655 |pmid=11800065 |access-date=2023-10-12 |archive-date=2023-10-20 |archive-url=https://web.archive.org/web/20231020123710/https://pubmed.ncbi.nlm.nih.gov/11800065/ |url-status=live }}</ref> Excess body fat is associated with 30% of cases in people of Chinese and Japanese descent, 60–80% of cases in those of European and African descent, and 100% of Pima Indians and Pacific Islanders.<ref name=Green2011/> Even those who are not obese may have a high [[waist–hip ratio]].<ref name=Green2011/>
In the early stage of type&nbsp;2 diabetes, the predominant abnormality is reduced insulin sensitivity. At this stage hyperglycemia can be reversed by a variety of measures and [[Anti-diabetic drug|medications]] that improve insulin sensitivity or reduce glucose production by the [[liver]].

Dietary factors such as [[sugar]]-sweetened drinks are associated with an increased risk.<ref name="SSB2010">{{cite journal | vauthors = Malik VS, Popkin BM, Bray GA, Després JP, Hu FB | title = Sugar-sweetened beverages, obesity, type 2 diabetes mellitus, and cardiovascular disease risk | journal = Circulation | volume = 121 | issue = 11 | pages = 1356–1364 | date = March 2010 | pmid = 20308626 | pmc = 2862465 | doi = 10.1161/CIRCULATIONAHA.109.876185 }}</ref><ref>{{cite journal | vauthors = Malik VS, Popkin BM, Bray GA, Després JP, Willett WC, Hu FB | title = Sugar-sweetened beverages and risk of metabolic syndrome and type 2 diabetes: a meta-analysis | journal = Diabetes Care | volume = 33 | issue = 11 | pages = 2477–2483 | date = November 2010 | pmid = 20693348 | pmc = 2963518 | doi = 10.2337/dc10-1079 }}</ref> The type of [[fat]]s in the diet is also important, with [[saturated fat]] and [[trans fat]]s increasing the risk and [[polyunsaturated fat|polyunsaturated]] and [[monounsaturated fat]] decreasing the risk.<ref name="Fat2009" /> Eating [[white rice]] excessively may increase the risk of diabetes, especially in Chinese and Japanese people.<ref>{{cite journal | vauthors = Hu EA, Pan A, Malik V, Sun Q | title = White rice consumption and risk of type 2 diabetes: meta-analysis and systematic review | journal = BMJ | volume = 344 | pages = e1454 | date = March 2012 | pmid = 22422870 | pmc = 3307808 | doi = 10.1136/bmj.e1454 }}</ref> Lack of physical activity may increase the risk of diabetes in some people.<ref name="pmid22818936">{{cite journal | vauthors = Lee IM, Shiroma EJ, Lobelo F, Puska P, Blair SN, Katzmarzyk PT | title = Effect of physical inactivity on major non-communicable diseases worldwide: an analysis of burden of disease and life expectancy | journal = Lancet | volume = 380 | issue = 9838 | pages = 219–229 | date = July 2012 | pmid = 22818936 | pmc = 3645500 | doi = 10.1016/S0140-6736(12)61031-9 }}</ref>

[[Adverse Childhood Experiences Study|Adverse childhood experiences]], including abuse, neglect, and household difficulties, increase the likelihood of type 2 diabetes later in life by 32%, with [[neglect]] having the strongest effect.<ref>{{cite journal | vauthors = Huang H, Yan P, Shan Z, Chen S, Li M, Luo C, Gao H, Hao L, Liu L | display-authors = 6 | title = Adverse childhood experiences and risk of type 2 diabetes: A systematic review and meta-analysis | journal = Metabolism | volume = 64 | issue = 11 | pages = 1408–1418 | date = November 2015 | pmid = 26404480 | doi = 10.1016/j.metabol.2015.08.019 }}</ref>

[[Antipsychotic|Antipsychotic medication]] side effects (specifically metabolic abnormalities, [[dyslipidemia]] and weight gain) are also potential risk factors.<ref>{{cite journal | vauthors = Zhang Y, Liu Y, Su Y, You Y, Ma Y, Yang G, Song Y, Liu X, Wang M, Zhang L, Kou C | display-authors = 6 | title = The metabolic side effects of 12 antipsychotic drugs used for the treatment of schizophrenia on glucose: a network meta-analysis | journal = BMC Psychiatry | volume = 17 | issue = 1 | pages = 373 | date = November 2017 | pmid = 29162032 | pmc = 5698995 | doi = 10.1186/s12888-017-1539-0 | doi-access = free }}</ref>


===Gestational diabetes===
===Gestational diabetes===
{{Main|Gestational diabetes}}
{{Main|Gestational diabetes}}
Gestational diabetes resembles type 2 diabetes in several respects, involving a combination of relatively inadequate insulin secretion and responsiveness. It occurs in about 2–10% of all [[pregnancy|pregnancies]] and may improve or disappear after delivery.<ref name=NDIC_Stats>{{cite web|title=National Diabetes Clearinghouse (NDIC): National Diabetes Statistics 2011|url=http://diabetes.niddk.nih.gov/dm/pubs/statistics/#Gestational|publisher=U.S. Department of Health and Human Services|access-date=22 April 2014|url-status=dead|archive-url=https://web.archive.org/web/20140417143052/http://diabetes.niddk.nih.gov/dm/pubs/statistics/#Gestational|archive-date=17 April 2014}}</ref> It is recommended that all pregnant women get tested starting around 24–28 weeks gestation.<ref name=":2">{{Cite journal| vauthors = Soldavini J |date=November 2019|title=Krause's Food & The Nutrition Care Process|journal=Journal of Nutrition Education and Behavior|volume=51|issue=10|pages=1225|doi=10.1016/j.jneb.2019.06.022|s2cid=209272489|issn=1499-4046}}</ref> It is most often diagnosed in the second or third trimester because of the increase in insulin-antagonist hormone levels that occurs at this time.<ref name=":2" /> However, after pregnancy approximately 5–10% of women with gestational diabetes are found to have another form of diabetes, most commonly type 2.<ref name=NDIC_Stats /> Gestational diabetes is fully treatable, but requires careful medical supervision throughout the pregnancy. Management may include dietary changes, blood glucose monitoring, and in some cases, insulin may be required.<ref>{{Cite web|url=https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/gestational/management-treatment|title=Managing & Treating Gestational Diabetes {{!}} NIDDK|website=National Institute of Diabetes and Digestive and Kidney Diseases|access-date=2019-05-06|archive-date=2019-05-06|archive-url=https://web.archive.org/web/20190506202142/https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/gestational/management-treatment|url-status=live}}</ref>


Though it may be transient, untreated gestational diabetes can damage the health of the fetus or mother. Risks to the baby include [[macrosomia]] (high birth weight), [[Congenital heart defect|congenital heart]] and [[central nervous system]] abnormalities, and [[skeletal muscle]] malformations. Increased levels of insulin in a fetus's blood may inhibit fetal [[surfactant]] production and cause [[infant respiratory distress syndrome]]. A [[Bilirubin#Hyperbilirubinemia|high blood bilirubin level]] may result from [[hemolysis|red blood cell destruction]]. In severe cases, perinatal death may occur, most commonly as a result of poor placental perfusion due to vascular impairment. [[Labor induction]] may be indicated with decreased placental function. A [[caesarean section]] may be performed if there is marked [[fetal distress]]<ref>{{cite journal | vauthors = Tarvonen M, Hovi P, Sainio S, Vuorela P, Andersson S, Teramo K | title = Intrapartal cardiotocographic patterns and hypoxia-related perinatal outcomes in pregnancies complicated by gestational diabetes mellitus | journal = Acta Diabetologica | volume = 58 | issue = 11 | pages = 1563–1573 | date = November 2021 | pmid = 34151398 | pmc = 8505288 | doi = 10.1007/s00592-021-01756-0 | s2cid = 235487220 | doi-access = free }}</ref> or an increased risk of injury associated with macrosomia, such as [[shoulder dystocia]].<ref>{{Cite book |author=National Collaborating Centre for Women's and Children's Health |date=February 2015 |chapter=Intrapartum care |chapter-url=https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0080685/ |title=Diabetes in Pregnancy: Management of diabetes and its complications from preconception to the postnatal period |publisher=National Institute for Health and Care Excellence (UK) |access-date=2018-08-21 |archive-date=2021-08-28 |archive-url=https://web.archive.org/web/20210828061326/https://www.ncbi.nlm.nih.gov/books/NBK328350/ |url-status=live }}</ref>
Gestational diabetes mellitus (GDM) resembles type&nbsp;2 diabetes in several respects, involving a combination of relatively inadequate insulin secretion and responsiveness. It occurs in about 2%–5% of all [[pregnancy|pregnancies]] and may improve or disappear after delivery. Gestational diabetes is fully treatable but requires careful medical supervision throughout the pregnancy. About 20%–50% of affected women develop type&nbsp;2 diabetes later in life.


===Other types===
Even though it may be transient, untreated gestational diabetes can damage the health of the fetus or mother. Risks to the baby include [[macrosomia]] (high birth weight), congenital cardiac and central nervous system anomalies, and skeletal muscle malformations. Increased fetal insulin may inhibit fetal [[surfactant]] production and cause [[Infant respiratory distress syndrome|respiratory distress syndrome]]. [[Hyperbilirubinemia]] may result from red blood cell destruction. In severe cases, perinatal death may occur, most commonly as a result of poor placental perfusion due to vascular impairment. [[Labor induction]] may be indicated with decreased placental function. A [[Caesarean section|cesarean section]] may be performed if there is marked fetal distress or an increased risk of injury associated with [[macrosomia]], such as [[shoulder dystocia]].
[[Maturity onset diabetes of the young]] (MODY) is a rare [[Dominance (genetics)|autosomal dominant]] inherited form of diabetes, due to one of several single-gene mutations causing defects in insulin production.<ref>{{cite web|title=Monogenic Forms of Diabetes|url=https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/monogenic-neonatal-mellitus-mody#3|website=National institute of diabetes and digestive and kidney diseases|publisher=US NIH|access-date=12 March 2017|url-status=live|archive-url=https://web.archive.org/web/20170312195627/https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/monogenic-neonatal-mellitus-mody#3|archive-date=12 March 2017}}</ref> It is significantly less common than the three main types, constituting 1–2% of all cases. The name of this disease refers to early hypotheses as to its nature. Being due to a defective gene, this disease varies in age at presentation and in severity according to the specific gene defect; thus, there are at least 13 subtypes of MODY. People with MODY often can control it without using insulin.<ref>{{cite journal | vauthors = Thanabalasingham G, Owen KR | title = Diagnosis and management of maturity onset diabetes of the young (MODY) | journal = BMJ | volume = 343 | issue = oct19 3 | pages = d6044 | date = October 2011 | pmid = 22012810 | doi = 10.1136/bmj.d6044 | s2cid = 44891167 }}</ref>


Some cases of diabetes are caused by the body's tissue receptors not responding to insulin (even when insulin levels are normal, which is what separates it from type&nbsp;2 diabetes); this form is very uncommon. Genetic mutations ([[Dominance (genetics)|autosomal]] or [[Mitochondrion|mitochondrial]]) can lead to defects in beta cell function. Abnormal insulin action may also have been genetically determined in some cases. Any disease that causes extensive damage to the pancreas may lead to diabetes (for example, [[chronic pancreatitis]] and [[cystic fibrosis]]). Diseases associated with excessive secretion of [[insulin receptor|insulin-antagonistic]] hormones can cause diabetes (which is typically resolved once the [[hormone]] excess is removed). Many drugs impair insulin secretion and some toxins damage pancreatic beta cells, whereas others increase [[insulin resistance]] (especially [[glucocorticoid]]s which can provoke "[[steroid diabetes]]"). The [[ICD-10]] (1992) diagnostic entity, ''malnutrition-related diabetes mellitus'' (ICD-10 code E12), was deprecated by the [[World Health Organization]] (WHO) when the current taxonomy was introduced in 1999.<ref name="WHO1999-DefDiagClass">{{cite web |publisher=[[World Health Organization]] |title=Definition, Diagnosis and Classification of Diabetes Mellitus and its Complications |year=1999 |url=http://whqlibdoc.who.int/hq/1999/WHO_NCD_NCS_99.2.pdf |url-status=live |archive-url=https://web.archive.org/web/20030308005119/http://whqlibdoc.who.int/hq/1999/WHO_NCD_NCS_99.2.pdf |archive-date=2003-03-08}}</ref> Yet another form of diabetes that people may develop is [[double diabetes]]. This is when a type 1 diabetic becomes insulin resistant, the hallmark for type 2 diabetes or has a family history for type 2 diabetes.<ref>{{cite journal | vauthors = Cleland SJ, Fisher BM, Colhoun HM, Sattar N, Petrie JR | title = Insulin resistance in type 1 diabetes: what is 'double diabetes' and what are the risks? | journal = Diabetologia | volume = 56 | issue = 7 | pages = 1462–1470 | date = July 2013 | pmid = 23613085 | pmc = 3671104 | doi = 10.1007/s00125-013-2904-2 | publisher = National Library of Medicine }}</ref> It was first discovered in 1990 or 1991.
A 2008 study completed in the U.S. found that the number of American women entering pregnancy with preexisting diabetes is increasing. In fact the rate of diabetes in expectant mothers has more than doubled in the past 6 years.<ref>{{Cite journal|author=Lawrence JM, Contreras R, Chen W, Sacks DA |title=Trends in the prevalence of preexisting diabetes and gestational diabetes mellitus among a racially/ethnically diverse population of pregnant women, 1999–2005 |journal=Diabetes Care |volume=31 |issue=5 |pages=899–904 |year=2008 |month=May |pmid=18223030 |doi=10.2337/dc07-2345}}</ref> This is particularly problematic as diabetes raises the risk of complications during pregnancy, as well as increasing the potential that the children of diabetic mothers will also become diabetic in the future.


The following is a list of disorders that may increase the risk of diabetes:<ref name=Robbins>Unless otherwise specified, reference is: Table 20-5 in {{Cite book|author1=Mitchell, Richard Sheppard |author2=Kumar, Vinay |author3=Abbas, Abul K. |author4=Fausto, Nelson |title=Robbins Basic Pathology|publisher=Saunders |location=Philadelphia |isbn=978-1-4160-2973-1 |edition=8th |year=2007 }}</ref>
===Other types===
{{Col-float-begin}}
[[Pre-diabetes]] indicates a condition that occurs when a person's blood glucose levels are higher than normal but not high enough for a diagnosis of type&nbsp;2 diabetes.
* Genetic defects of β-cell function
Many people destined to develop type 2 diabetes spend many years in a state of pre-diabetes which has been termed "America's largest healthcare epidemic."<ref>{{cite journal | last1 = Handelsman | first1 = Yehuda | last2 = MD | first2 = | year = | title = A Doctor's Diagnosis: Prediabetes | url = | journal = Power of Prevention | volume = 1 | issue = 2| page = 2009 | author-separator =, | author-name-separator= }}</ref>{{Rp|10–11|date=July 2009}}
** [[Maturity onset diabetes of the young]]
** Mitochondrial DNA mutations
* Genetic defects in insulin processing or insulin action
** Defects in [[proinsulin]] conversion
** Insulin gene mutations
** Insulin receptor mutations
* Exocrine pancreatic defects (see [[Type 3c diabetes]], i.e. pancreatogenic diabetes)
** [[Chronic pancreatitis]]
** [[Pancreatectomy]]
** [[Pancreatic neoplasia]]
** [[Cystic fibrosis]]
** [[Hemochromatosis]]
** [[Fibrocalculous pancreatopathy]]
{{Col-float-break}}
* [[Endocrinopathies]]
** Growth hormone excess ([[acromegaly]])
** [[Cushing syndrome]]
** [[Hyperthyroidism]]
** [[Hypothyroidism]]
** [[Pheochromocytoma]]
** [[Glucagonoma]]
* Infections
** [[Cytomegalovirus infection]]
** [[Coxsackie B4 virus|Coxsackievirus B]]
* Drugs
** [[Glucocorticoids]]
** [[Thyroid hormone]]
** [[β-adrenergic agonist]]s
** [[Statins]]<ref name="pmid20167359">{{cite journal | vauthors = Sattar N, Preiss D, Murray HM, Welsh P, Buckley BM, de Craen AJ, Seshasai SR, McMurray JJ, Freeman DJ, Jukema JW, Macfarlane PW, Packard CJ, Stott DJ, Westendorp RG, Shepherd J, Davis BR, Pressel SL, Marchioli R, Marfisi RM, Maggioni AP, Tavazzi L, Tognoni G, Kjekshus J, Pedersen TR, Cook TJ, Gotto AM, Clearfield MB, Downs JR, Nakamura H, Ohashi Y, Mizuno K, Ray KK, Ford I | display-authors = 6 | title = Statins and risk of incident diabetes: a collaborative meta-analysis of randomised statin trials | journal = Lancet | volume = 375 | issue = 9716 | pages = 735–742 | date = February 2010 | pmid = 20167359 | doi = 10.1016/S0140-6736(09)61965-6 | s2cid = 11544414 }}</ref>
{{Col-float-end}}


==Pathophysiology==
[[Latent autoimmune diabetes of adults]] is a condition in which [[Type 1 diabetes]] develops in adults. Adults with LADA are frequently initially misdiagnosed as having [[Type 2 diabetes]], based on age rather than [[etiology]].
[[File:Suckale08 fig3 glucose insulin day.png|thumb|upright=1.4|The fluctuation of [[Blood sugar level|blood sugar]] (red) and the sugar-lowering hormone [[insulin]] (blue) in humans during the course of a day with three meals. One of the effects of a [[sucrose|sugar]]-rich vs a [[starch]]-rich meal is highlighted.]]
[[File:Glucose-insulin-release.svg|thumb|upright=1.4|Mechanism of insulin release in normal pancreatic [[beta cell]]s. Insulin production is more or less constant within the beta cells. Its release is triggered by food, chiefly food containing absorbable glucose.]]
[[Insulin]] is the principal hormone that regulates the uptake of [[glucose]] from the blood into most cells of the body, especially liver, adipose tissue and muscle, except smooth muscle, in which insulin acts via the [[IGF-1]].<ref>{{Cite journal |last=Wilcox |first=Gisela |date=2005-05-05 |title=Insulin and Insulin Resistance |journal=Clinical Biochemist Reviews |volume=26 |issue=2 |pages=19–39 |issn=0159-8090 |pmc=1204764 |pmid=16278749}}</ref> Therefore, deficiency of insulin or the insensitivity of its [[Receptor (biochemistry)|receptors]] play a central role in all forms of diabetes mellitus.<ref>{{cite web |title=Insulin Basics |url=https://diabetes.org/healthy-living/medication-treatments/insulin-other-injectables/insulin-basics |publisher=American Diabetes Association |access-date=25 June 2023 |url-status=live |archive-url=https://web.archive.org/web/20230621163852/https://diabetes.org/healthy-living/medication-treatments/insulin-other-injectables/insulin-basics |archive-date=21 June 2023}}</ref>


The body obtains glucose from three main sources: the intestinal absorption of food; the breakdown of [[glycogen]] ([[glycogenolysis]]), the storage form of glucose found in the liver; and [[gluconeogenesis]], the generation of glucose from non-carbohydrate substrates in the body.<ref name=GreenspanEndo>{{cite book |veditors=Shoback DG, Gardner D |title=Greenspan's basic & clinical endocrinology |year=2011 |publisher=McGraw-Hill Medical |isbn=978-0-07-162243-1|edition=9th}}</ref> Insulin plays a critical role in regulating glucose levels in the body. Insulin can inhibit the breakdown of glycogen or the process of gluconeogenesis, it can stimulate the transport of glucose into fat and muscle cells, and it can stimulate the storage of glucose in the form of glycogen.<ref name=GreenspanEndo />
Some cases of diabetes are caused by the body's tissue receptors not responding to insulin (even when insulin levels are normal, which is what separates it from type&nbsp;2 diabetes); this form is very uncommon. Genetic mutations ([[Autosomal dominant|autosomal]] or [[mitochondrial]]) can lead to defects in [[beta cell]] function. Abnormal insulin action may also have been genetically determined in some cases. Any disease that causes extensive damage to the [[pancreas]] may lead to diabetes (for example, [[chronic pancreatitis]] and [[cystic fibrosis]]). Diseases associated with excessive secretion of [[insulin receptor|insulin-antagonistic]] [[hormone]]s can cause diabetes (which is typically resolved once the hormone excess is removed). Many drugs impair insulin secretion and some toxins damage pancreatic beta cells. The [[ICD]]-10 (1992) diagnostic entity, ''malnutrition-related diabetes mellitus'' (MRDM or MMDM, ICD-10 code E12), was deprecated by the [[World Health Organization]] when the current taxonomy was introduced in 1999.<ref name="WHO1999-DefDiagClass">{{Cite web|author=[[World Health Organisation]] Department of Noncommunicable Disease Surveillance|title=Definition, Diagnosis and Classification of Diabetes Mellitus and its Complications|year=1999|url=http://whqlibdoc.who.int/hq/1999/WHO_NCD_NCS_99.2.pdf|format=PDF}}</ref>


Insulin is released into the blood by beta cells (β-cells), found in the [[islets of Langerhans]] in the pancreas, in response to rising levels of blood glucose, typically after eating. Insulin is used by about two-thirds of the body's cells to absorb glucose from the blood for use as fuel, for conversion to other needed molecules, or for storage. Lower glucose levels result in decreased insulin release from the beta cells and in the breakdown of glycogen to glucose. This process is mainly controlled by the hormone [[glucagon]], which acts in the opposite manner to insulin.<ref name=GanongsPhys>{{cite book|vauthors=Barrett KE, etal |title=Ganong's review of medical physiology|year=2012 |publisher=McGraw-Hill Medical |isbn=978-0-07-178003-2 |edition=24th}}</ref>
==Signs and symptoms==
[[File:Main symptoms of diabetes.png|thumb|Overview of the most significant symptoms of diabetes.]]


If the amount of insulin available is insufficient, or if cells respond poorly to the effects of insulin ([[insulin resistance]]), or if the insulin itself is defective, then glucose is not absorbed properly by the body cells that require it, and is not stored appropriately in the liver and muscles. The net effect is persistently high levels of blood glucose, poor [[Protein biosynthesis|protein synthesis]], and other metabolic derangements, such as metabolic [[acidosis]] in cases of complete insulin deficiency.<ref name=GreenspanEndo />
The classical symptoms of diabetes are [[polyuria]] (frequent urination), [[polydipsia]] (increased thirst) and [[polyphagia]] (increased hunger).<ref>{{Cite journal|author=Cooke DW, Plotnick L |title=Type 1 diabetes mellitus in pediatrics |journal=Pediatr Rev |volume=29 |issue=11 |pages=374–84; quiz 385 |year=2008 |month=November |pmid=18977856 |doi=10.1542/pir.29-11-374 |url=}}</ref> Symptoms may develop rapidly (weeks or months) in type&nbsp;1 diabetes while in type&nbsp;2 diabetes they usually develop much more slowly and may be subtle or absent.


When there is too much glucose in the blood for a long time, the [[kidneys]] cannot absorb it all (reach a threshold of [[reabsorption]]) and the extra glucose gets passed out of the body through [[urine]] ([[glycosuria]]).<ref>{{cite book |vauthors=Murray RK, etal |title=Harper's illustrated biochemistry |year=2012|publisher=McGraw-Hill Medical |isbn=978-0-07-176576-3 |edition=29th}}</ref> This increases the [[osmotic pressure]] of the urine and inhibits reabsorption of water by the kidney, resulting in increased urine production ([[polyuria]]) and increased fluid loss. Lost blood volume is replaced osmotically from water in body cells and other body compartments, causing [[dehydration]] and increased thirst ([[polydipsia]]).<ref name=GreenspanEndo /> In addition, intracellular glucose deficiency stimulates appetite leading to excessive food intake (polyphagia).<ref>{{Cite book|title=Juta's Complete Textbook of Medical Surgical Nursing| vauthors = Mogotlane S |publisher=Juta|year=2013|location=Cape Town|pages=839}}</ref>
Prolonged high blood glucose causes glucose absorption, which leads to changes in the shape of the lenses of the eyes, resulting in vision changes; sustained sensible glucose control usually returns the lens to its original shape. Blurred vision is a common complaint leading to a diabetes diagnosis; type&nbsp;1 should always be suspected in cases of rapid vision change, whereas with type&nbsp;2 change is generally more gradual, but should still be suspected {{Citation needed|date=June 2011}}.


==Diagnosis==
People (usually with type&nbsp;1 diabetes) may also present with [[diabetic ketoacidosis]], a state of metabolic dysregulation characterized by the smell of [[acetone]]; a rapid, deep breathing known as [[Kussmaul breathing]]; nausea; vomiting and [[abdominal pain]]; and altered states of consciousness.
{{See also|Glycated hemoglobin|Glucose tolerance test}}


Diabetes mellitus is diagnosed with a test for the glucose content in the blood, and is diagnosed by demonstrating any one of the following:<ref name="WHO1999-DefDiagClass" />
A rarer but equally severe possibility is [[Nonketotic hyperosmolar coma|hyperosmolar nonketotic state]], which is more common in type&nbsp;2 diabetes and is mainly the result of dehydration. Often, the patient has been drinking extreme amounts of sugar-containing drinks, leading to a [[positive feedback|vicious circle]] in regard to the water loss.
* [[Fasting glucose|Fasting plasma glucose level]] ≥&nbsp;7.0&nbsp;mmol/L (126&nbsp;mg/dL). For this test, blood is taken after a period of fasting, i.e. in the morning before breakfast, after the patient had sufficient time to fast overnight or at least 8 hours before the test.
* [[Plasma glucose]] ≥&nbsp;11.1&nbsp;mmol/L (200&nbsp;mg/dL) two hours after a 75&nbsp;gram oral glucose load as in a [[glucose tolerance test]] (OGTT)
* Symptoms of high blood sugar and plasma glucose ≥&nbsp;11.1&nbsp;mmol/L (200&nbsp;mg/dL) either while fasting or not fasting
* [[Glycated hemoglobin]] (HbA<sub>1C</sub>) ≥&nbsp;48&nbsp;mmol/mol (≥&nbsp;6.5 [[Diabetes control and complications trial|DCCT]] %).<ref>{{cite journal | vauthors = | title = Summary of revisions for the 2010 Clinical Practice Recommendations | journal = Diabetes Care | volume = 33 | issue = Suppl 1 | pages = S3 | date = January 2010 | pmid = 20042773 | pmc = 2797388 | doi = 10.2337/dc10-S003 | url = http://care.diabetesjournals.org/content/33/Supplement_1/S3.full | access-date = 29 January 2010 | url-status = live | archive-url = https://web.archive.org/web/20100113212053/http://care.diabetesjournals.org/content/33/Supplement_1/S3.full | archive-date = 13 January 2010 }}</ref>


{{OGTT}}
A number of skin rashes can occur in diabetes that are collectively known as [[diabetic dermadromes]].
A positive result, in the absence of unequivocal high blood sugar, should be confirmed by a repeat of any of the above methods on a different day. It is preferable to measure a fasting glucose level because of the ease of measurement and the considerable time commitment of formal glucose tolerance testing, which takes two hours to complete and offers no prognostic advantage over the fasting test.<ref>{{cite journal | vauthors = Saydah SH, Miret M, Sung J, Varas C, Gause D, Brancati FL | title = Postchallenge hyperglycemia and mortality in a national sample of U.S. adults | journal = Diabetes Care | volume = 24 | issue = 8 | pages = 1397–1402 | date = August 2001 | pmid = 11473076 | doi = 10.2337/diacare.24.8.1397 | doi-access = free }}</ref> According to the current definition, two fasting glucose measurements at or above 7.0&nbsp;mmol/L (126&nbsp;mg/dL) is considered diagnostic for diabetes mellitus.


Per the WHO, people with fasting glucose levels from 6.1 to 6.9&nbsp;mmol/L (110 to 125&nbsp;mg/dL) are considered to have [[impaired fasting glycemia|impaired fasting glucose]].<ref>{{cite book |title=Definition and diagnosis of diabetes mellitus and intermediate hyperglycemia: report of a WHO/IDF consultation |url=https://www.who.int/diabetes/publications/Definition%20and%20diagnosis%20of%20diabetes_new.pdf |publisher=World Health Organization |page=21 |year=2006 |isbn=978-92-4-159493-6 |url-status=live |archive-url=https://web.archive.org/web/20120511072821/http://www.who.int/diabetes/publications/Definition%20and%20diagnosis%20of%20diabetes_new.pdf |archive-date=11 May 2012}}</ref> People with plasma glucose at or above 7.8&nbsp;mmol/L (140&nbsp;mg/dL), but not over 11.1&nbsp;mmol/L (200&nbsp;mg/dL), two hours after a 75&nbsp;gram oral glucose load are considered to have [[impaired glucose tolerance]]. Of these two prediabetic states, the latter in particular is a major risk factor for progression to full-blown diabetes mellitus, as well as cardiovascular disease.<ref>{{cite journal | vauthors = Santaguida PL, Balion C, Hunt D, Morrison K, Gerstein H, Raina P, Booker L, Yazdi H | display-authors = 6 | title = Diagnosis, prognosis, and treatment of impaired glucose tolerance and impaired fasting glucose | journal = Evidence Report/Technology Assessment | issue = 128 | pages = 1–11 | date = August 2005 | pmid = 16194123 | pmc = 4780988 | url = http://www.ahrq.gov/clinic/epcsums/impglusum.htm | access-date = 20 July 2008 | publisher = [[Agency for Healthcare Research and Quality]] | url-status = live | archive-url = https://web.archive.org/web/20080916030540/http://www.ahrq.gov/clinic/epcsums/impglusum.htm | archive-date = 16 September 2008 }}</ref> The [[American Diabetes Association]] (ADA) since 2003 uses a slightly different range for impaired fasting glucose of 5.6 to 6.9&nbsp;mmol/L (100 to 125&nbsp;mg/dL).<ref>{{cite journal | vauthors = Bartoli E, Fra GP, Carnevale Schianca GP | title = The oral glucose tolerance test (OGTT) revisited | journal = European Journal of Internal Medicine | volume = 22 | issue = 1 | pages = 8–12 | date = February 2011 | pmid = 21238885 | doi = 10.1016/j.ejim.2010.07.008 }}</ref>
==Causes==
The cause of diabetes depends on the type.


[[Glycated hemoglobin]] is better than [[fasting glucose]] for determining risks of cardiovascular disease and death from any cause.<ref>{{cite journal | vauthors = Selvin E, Steffes MW, Zhu H, Matsushita K, Wagenknecht L, Pankow J, Coresh J, Brancati FL | display-authors = 6 | title = Glycated hemoglobin, diabetes, and cardiovascular risk in nondiabetic adults | journal = The New England Journal of Medicine | volume = 362 | issue = 9 | pages = 800–811 | date = March 2010 | pmid = 20200384 | pmc = 2872990 | doi = 10.1056/NEJMoa0908359 | citeseerx = 10.1.1.589.1658 }}</ref>
Type&nbsp;1 diabetes is partly inherited and then triggered by certain infections, with some evidence pointing at [[Coxsackie B4 virus]]. There is a genetic element in individual susceptibility to some of these triggers which has been traced to particular [[Human leukocyte antigen|HLA]] [[genotype]]s (i.e., the genetic "self" identifiers relied upon by the immune system). However, even in those who have inherited the susceptibility, type&nbsp;1 diabetes mellitus seems to require an environmental trigger.


==Prevention==
Type&nbsp;2 diabetes is due primarily to lifestyle factors and genetics.<ref name=Fat2009>{{Cite journal|author=Risérus U, [[Walter Willett|Willett WC]], Hu FB |title=Dietary fats and prevention of type 2 diabetes |journal=Progress in Lipid Research |volume=48 |issue=1 |pages=44–51 |year=2009 |month=January |pmid=19032965 |doi=10.1016/j.plipres.2008.10.002 |pmc=2654180}}</ref>
{{See also|Prevention of type 2 diabetes}}
There is no known [[Preventive healthcare|preventive]] measure for type&nbsp;1 diabetes.<ref name="WHO2022"/> However, islet autoimmunity and multiple antibodies can be a strong predictor of the onset of type 1 diabetes.<ref>{{Cite journal |last1=Jacobsen |first1=Laura M. |last2=Haller |first2=Michael J. |last3=Schatz |first3=Desmond A. |date=2018-03-06 |title=Understanding Pre-Type 1 Diabetes: The Key to Prevention |journal= Frontiers in Endocrinology|volume=9 |page=70 |doi=10.3389/fendo.2018.00070 |pmid=29559955 |pmc=5845548 |doi-access=free }}</ref> Type&nbsp;2 diabetes—which accounts for 85–90% of all cases worldwide—can often be prevented or delayed<ref>{{cite journal | vauthors = | title = Tackling risk factors for type 2 diabetes in adolescents: PRE-STARt study in Euskadi | journal = Anales de Pediatria | volume = 95 | issue = 3 | pages = 186–196 | date = 2020 | pmid = 33388268 | doi = 10.1016/j.anpedi.2020.11.001 | publisher = Anales de Pediatría | doi-access = free }}</ref> by maintaining a [[normal body weight]], engaging in physical activity, and eating a healthy diet.<ref name="WHO2022"/> Higher levels of physical activity (more than 90 minutes per day) reduce the risk of diabetes by 28%.<ref name= BMJ2016>{{cite journal | vauthors = Kyu HH, Bachman VF, Alexander LT, Mumford JE, Afshin A, Estep K, Veerman JL, Delwiche K, Iannarone ML, Moyer ML, Cercy K, Vos T, Murray CJ, Forouzanfar MH | display-authors = 6 | title = Physical activity and risk of breast cancer, colon cancer, diabetes, ischemic heart disease, and ischemic stroke events: systematic review and dose-response meta-analysis for the Global Burden of Disease Study 2013 | journal = BMJ | volume = 354 | pages = i3857 | date = August 2016 | pmid = 27510511 | pmc = 4979358 | doi = 10.1136/bmj.i3857 }}</ref> Dietary changes known to be effective in helping to prevent diabetes include maintaining a diet rich in [[whole grain]]s and [[Dietary fiber|fiber]], and choosing good fats, such as the [[polyunsaturated fat]]s found in nuts, vegetable oils, and fish.<ref name=HarvardNutrition>{{cite web|website=The Nutrition Source|title = Simple Steps to Preventing Diabetes |date = 18 September 2012 |url=http://www.hsph.harvard.edu/nutritionsource/preventing-diabetes-full-story/#references |publisher= Harvard T.H. Chan School of Public Health|url-status=live|archive-url=https://web.archive.org/web/20140425020720/http://www.hsph.harvard.edu/nutritionsource/preventing-diabetes-full-story/#references|archive-date=25 April 2014}}</ref> Limiting sugary beverages and eating less red meat and other sources of [[saturated fat]] can also help prevent diabetes.<ref name=HarvardNutrition /> Tobacco smoking is also associated with an increased risk of diabetes and its complications, so [[smoking cessation]] can be an important preventive measure as well.<ref>{{cite journal | vauthors = Willi C, Bodenmann P, Ghali WA, Faris PD, Cornuz J | title = Active smoking and the risk of type 2 diabetes: a systematic review and meta-analysis | journal = JAMA | volume = 298 | issue = 22 | pages = 2654–2664 | date = December 2007 | pmid = 18073361 | doi = 10.1001/jama.298.22.2654 | s2cid = 30550981 }}</ref>


The relationship between type 2 diabetes and the main modifiable risk factors (excess weight, unhealthy diet, physical inactivity and tobacco use) is similar in all regions of the world. There is growing evidence that the underlying determinants of diabetes are a reflection of the major forces driving social, economic and cultural change: [[globalization]], urbanization, population aging, and the general [[health policy]] environment.<ref>{{cite web |publisher=World Health Organization |url=https://www.who.int/chp/chronic_disease_report/media/Factsheet1.pdf |title=Chronic diseases and their common risk factors |url-status=live |archive-url=https://web.archive.org/web/20161017172040/http://www.who.int/chp/chronic_disease_report/media/Factsheet1.pdf |archive-date=2016-10-17 |date=2005 |access-date=30 August 2016}}</ref>
Following is a comprehensive list of other causes of diabetes:<ref name=Robbins>Unless otherwise specified, reference is: Table 20-5 in {{Cite book|author=Mitchell, Richard Sheppard; Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson |title=Robbins Basic Pathology|publisher=Saunders |location=Philadelphia |year= |pages= |isbn=1-4160-2973-7 |doi=}} 8th edition.</ref>
{{Col-begin}}
{{Col-2}}
*Genetic defects of β-cell Function
**[[Maturity onset diabetes of the young]] (MODY)
**Mitochondrial DNA mutations
*Genetic defects in insulin processing or insulin action
**Defects in [[proinsulin]] conversion
**Insulin gene mutations
**Insulin receptor mutations
*Exocrine Pancreatic Defects
**[[Chronic pancreatitis]]
**[[Pancreatectomy]]
**[[Pancreatic neoplasia]]
**[[Cystic fibrosis]]
**[[Hemochromatosis]]
**[[Fibrocalculous pancreatopathy]]
{{Col-2}}
*[[Endocrinopathies]]
**Growth hormone excess ([[acromegaly]])
**[[Cushing syndrome]]
**[[Hyperthyroidism]]
**[[Pheochromocytoma]]
**[[Glucagonoma]]
*Infections
**[[Cytomegalovirus infection]]
**[[Coxsackie B4 virus|Coxsackievirus B]]
*Drugs
**[[Glucocorticoids]]
**[[Thyroid hormone]]
**[[β-adrenergic agonist]]s
{{Col-end}}


==Pathophysiology==
== Comorbidity ==
Diabetes patients' comorbidities have a significant impact on medical expenses and related costs. It has been demonstrated that patients with diabetes are more likely to experience respiratory, urinary tract, and skin infections, develop atherosclerosis, hypertension, and chronic kidney disease, putting them at increased risk of infection and complications that require medical attention.<ref>{{Cite web |last=CDC |date=2023-07-31 |title=Diabetes and Your Immune System |url=https://www.cdc.gov/diabetes/library/features/diabetes_immune_system.html |access-date=2024-04-25 |website=Centers for Disease Control and Prevention }}</ref> Patients with diabetes mellitus are more likely to experience certain infections, such as COVID-19, with prevalence rates ranging from 5.3 to 35.5%.<ref>{{Cite journal |last1=Singh |first1=Awadhesh Kumar |last2=Gupta |first2=Ritesh |last3=Ghosh |first3=Amerta |last4=Misra |first4=Anoop |date=2020 |title=Diabetes in COVID-19: Prevalence, pathophysiology, prognosis and practical considerations |journal=Diabetes & Metabolic Syndrome |volume=14 |issue=4 |pages=303–310 |doi=10.1016/j.dsx.2020.04.004 |issn=1878-0334 |pmc=7195120 |pmid=32298981}}</ref><ref>{{Cite journal |last1=Abdelhafiz |first1=Ahmed H. |last2=Emmerton |first2=Demelza |last3=Sinclair |first3=Alan J. |date=July 2021 |title=Diabetes in COVID-19 pandemic-prevalence, patient characteristics and adverse outcomes |journal=International Journal of Clinical Practice |volume=75 |issue=7 |pages=e14112 |doi=10.1111/ijcp.14112 |issn=1742-1241 |pmc=7995213 |pmid=33630378}}</ref> Maintaining adequate glycemic control is the primary goal of diabetes management since it is critical to managing diabetes and preventing or postponing such complications.<ref>{{Cite journal |date=1998-09-12 |title=Intensive blood-glucose control with sulphonylureas or insulin compared with conventional treatment and risk of complications in patients with type 2 diabetes (UKPDS 33). UK Prospective Diabetes Study (UKPDS) Group |url=https://pubmed.ncbi.nlm.nih.gov/9742976/ |journal=Lancet |volume=352 |issue=9131 |pages=837–853 |doi=10.1016/S0140-6736(98)07019-6 |issn=0140-6736 |pmid=9742976}}</ref>
{{Unreferenced section|date=November 2009}}
[[Image:Suckale08 fig3 glucose insulin day.jpg|thumb|The fluctuation of blood sugar (red) and the sugar-lowering hormone [[insulin]] (blue) in humans during the course of a day with three meals. One of the effects of a [[sucrose|sugar]]-rich vs a [[starch]]-rich meal is highlighted.]]
[[Image:Glucose-insulin-release.png|thumb|Mechanism of insulin release in normal pancreatic beta cells. Insulin production is more or less constant within the beta cells. Its release is triggered by food, chiefly food containing absorbable glucose.]]
Insulin is the principal hormone that regulates uptake of [[glucose]] from the blood into most cells (primarily muscle and fat cells, but not central nervous system cells). Therefore deficiency of insulin or the insensitivity of its [[Receptor (biochemistry)|receptors]] plays a central role in all forms of diabetes mellitus.


People with type 1 diabetes have higher rates of [[autoimmune disorders]] than the general population. An analysis of a type 1 diabetes registry found that 27% of the 25,000 participants had other autoimmune disorders.<ref name="Williams Textbook">{{cite book |vauthors=Atkinson MA, Mcgill DE, Dassau E, Laffel L |chapter=Type 1 diabetes mellitus |title=Williams Textbook of Endocrinology |publisher=Elsevier |date=2020 |pages=1403}}</ref> Between 2% and 16% of people with type 1 diabetes also have [[celiac disease]].<ref name="Williams Textbook"/>
Humans are capable of digesting some [[Carbohydrate metabolism|carbohydrates]], in particular those most common in food; starch, and some disaccharides such as sucrose, are converted within a few hours to simpler forms most notably the [[monosaccharide]] [[glucose]], the principal carbohydrate energy source used by the body. The rest are passed on for processing by gut flora largely in the colon. Insulin is released into the blood by beta cells (β-cells), found in the Islets of Langerhans in the pancreas, in response to rising levels of blood glucose, typically after eating. Insulin is used by about two-thirds of the body's cells to absorb glucose from the blood for use as fuel, for conversion to other needed molecules, or for storage.


==Management==
Insulin is also the principal control signal for conversion of glucose to [[glycogen]] for internal storage in liver and muscle cells. Lowered glucose levels result both in the reduced release of insulin from the beta cells and in the reverse conversion of glycogen to glucose when glucose levels fall. This is mainly controlled by the hormone [[glucagon]] which acts in the opposite manner to insulin. Glucose thus forcibly produced from internal liver cell stores (as glycogen) re-enters the bloodstream; muscle cells lack the necessary export mechanism. Normally liver cells do this when the level of insulin is low (which normally correlates with low levels of blood glucose).
{{Main|Diabetes management}}
Diabetes management concentrates on keeping blood sugar levels close to normal, without causing low blood sugar.<ref name="niddk16">{{cite web |title=Managing diabetes |url=https://www.niddk.nih.gov/health-information/diabetes/overview/managing-diabetes |publisher=National Institute of Diabetes and Digestive and Kidney Diseases, US National Institutes of Health |access-date=4 February 2023 |date=1 December 2016 |archive-date=6 March 2023 |archive-url=https://web.archive.org/web/20230306044924/https://www.niddk.nih.gov/health-information/diabetes/overview/managing-diabetes |url-status=live }}</ref> This can usually be accomplished with dietary changes,<ref>{{cite journal | vauthors = Toumpanakis A, Turnbull T, Alba-Barba I | title = Effectiveness of plant-based diets in promoting well-being in the management of type 2 diabetes: a systematic review | journal = BMJ Open Diabetes Research & Care | volume = 6 | issue = 1 | pages = e000534 | date = 2018-10-30 | pmid = 30487971 | pmc = 6235058 | doi = 10.1136/bmjdrc-2018-000534 }}</ref> exercise, weight loss, and use of appropriate medications (insulin, oral medications).<ref name=niddk16/>


Learning about the disease and actively participating in the treatment is important, since complications are far less common and less severe in people who have well-managed blood sugar levels.<ref name=niddk16/><ref>{{cite journal|title = The effect of intensive diabetes therapy on the development and progression of neuropathy|author=The Diabetes Control and Complications Trial Research Group | journal = Annals of Internal Medicine | volume = 122 | issue = 8 | pages = 561–568 | date = April 1995 | pmid = 7887548 | doi = 10.7326/0003-4819-122-8-199504150-00001 | s2cid = 24754081 }}</ref> The goal of treatment is an A1C level below 7%.<ref name="niddka1c">{{cite web |title=The A1C test and diabetes |url=https://www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test |publisher=National Institute of Diabetes and Digestive and Kidney Diseases, US National Institutes of Health |access-date=4 February 2023 |date=1 April 2018 |archive-date=4 February 2023 |archive-url=https://web.archive.org/web/20230204214740/https://www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test |url-status=live }}</ref><ref>{{cite journal |display-authors=3| vauthors = Qaseem A, Wilt TJ, Kansagara D, Horwitch C, Barry MJ, Forciea MA, Fitterman N, Balzer K, Boyd C, Humphrey LL, Iorio A, Lin J, Maroto M, McLean R, Mustafa R, Tufte J | title = Hemoglobin A1c Targets for Glycemic Control With Pharmacologic Therapy for Nonpregnant Adults With Type 2 Diabetes Mellitus: A Guidance Statement Update From the American College of Physicians | journal = Annals of Internal Medicine | volume = 168 | issue = 8 | pages = 569–576 | date = April 2018 | pmid = 29507945 | doi = 10.7326/M17-0939 | doi-access = free }}</ref> Attention is also paid to other health problems that may accelerate the negative effects of diabetes. These include [[smoking]], [[hypertension|high blood pressure]], [[metabolic syndrome]] [[obesity]], and lack of regular [[exercise]].<ref name=niddk16/><ref name=NICE66>{{NICE|66|Type 2 diabetes|2008}}</ref> [[Diabetic shoe|Specialized footwear]] is widely used to reduce the risk of [[diabetic foot ulcer]]s by relieving the pressure on the foot.<ref>{{cite journal | vauthors = Bus SA, van Deursen RW, Armstrong DG, Lewis JE, Caravaggi CF, Cavanagh PR | title = Footwear and offloading interventions to prevent and heal foot ulcers and reduce plantar pressure in patients with diabetes: a systematic review | journal = Diabetes/Metabolism Research and Reviews | volume = 32 | issue = Suppl 1 | pages = 99–118 | date = January 2016 | pmid = 26342178 | doi = 10.1002/dmrr.2702 | s2cid = 24862853 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Heuch L, Streak Gomersall J | title = Effectiveness of offloading methods in preventing primary diabetic foot ulcers in adults with diabetes: a systematic review | journal = JBI Database of Systematic Reviews and Implementation Reports | volume = 14 | issue = 7 | pages = 236–265 | date = July 2016 | pmid = 27532798 | doi = 10.11124/JBISRIR-2016-003013 | s2cid = 12012686 }}</ref><ref>{{cite journal | vauthors = van Netten JJ, Raspovic A, Lavery LA, Monteiro-Soares M, Rasmussen A, Sacco IC, Bus SA | title = Prevention of foot ulcers in the at-risk patient with diabetes: a systematic review | journal = Diabetes/Metabolism Research and Reviews | volume = 36 | issue = S1 Suppl 1 | pages = e3270 | date = March 2020 | pmid = 31957213 | doi = 10.1002/dmrr.3270 | s2cid = 210830578 | url = https://eprints.qut.edu.au/220879/1/Van%2BNetten%2Bet%2Bal%2B-%2B2016%2B-%2BPrevention%2Bof%2Bfoot%2Bulcers%2Bsystematic%2Breview.pdf | access-date = 2023-01-23 | archive-date = 2023-02-09 | archive-url = https://web.archive.org/web/20230209225712/https://eprints.qut.edu.au/220879/1/Van%2BNetten%2Bet%2Bal%2B-%2B2016%2B-%2BPrevention%2Bof%2Bfoot%2Bulcers%2Bsystematic%2Breview.pdf | url-status = live }}</ref> Foot examination for patients living with diabetes should be done annually which includes sensation testing, foot [[biomechanics]], vascular integrity and foot structure.<ref>{{cite journal | vauthors = Mayfield JA, Reiber GE, Sanders LJ, Janisse D, Pogach LM | title = Preventive foot care in diabetes | journal = Diabetes Care | volume = 27 | issue = suppl_1 | pages = S63–S64 | date = January 2004 | pmid = 14693928 | doi = 10.2337/diacare.27.2007.S63 | doi-access = free }}</ref>
Higher insulin levels increase some [[anabolism|anabolic]] ("building up") processes such as cell growth and duplication, [[protein biosynthesis|protein synthesis]], and [[lipid|fat]] storage. Insulin (or its lack) is the principal signal in converting many of the bidirectional processes of metabolism from a [[catabolism|catabolic]] to an anabolic direction, and vice versa. In particular, a low insulin level is the trigger for entering or leaving ketosis (the fat burning metabolic phase).


Concerning those with severe [[Mental disorder|mental illness]], the efficacy of [[type 2 diabetes]] self-management interventions is still poorly explored, with insufficient scientific evidence to show whether these interventions have similar results to those observed in the general population.<ref>{{cite journal | vauthors = McBain H, Mulligan K, Haddad M, Flood C, Jones J, Simpson A | title = Self management interventions for type 2 diabetes in adult people with severe mental illness | journal = The Cochrane Database of Systematic Reviews | volume = 2016 | pages = CD011361 | date = April 2016 | issue = 4 | pmid = 27120555 | doi = 10.1002/14651858.CD011361.pub2 | collaboration = Cochrane Metabolic and Endocrine Disorders Group | pmc = 10201333 }}</ref>
If the amount of insulin available is insufficient, if cells respond poorly to the effects of insulin (insulin insensitivity or [[insulin resistance|resistance]]), or if the insulin itself is defective, then glucose will not have its usual effect so that glucose will not be absorbed properly by those body cells that require it nor will it be stored appropriately in the liver and muscles. The net effect is persistent high levels of blood glucose, poor protein synthesis, and other metabolic derangements, such as [[acidosis]].


===Lifestyle===
When the glucose concentration in the blood is raised beyond its [[renal threshold]] (about 10&nbsp;mmol/L, although this may be altered in certain conditions, such as pregnancy), [[reabsorption]] of glucose in the [[proximal tubule|proximal renal tubuli]] is incomplete, and part of the glucose remains in the [[urine]] ([[glycosuria]]). This increases the [[osmotic pressure]] of the urine and inhibits reabsorption of water by the kidney, resulting in increased urine production ([[polyuria]]) and increased fluid loss. Lost blood volume will be replaced osmotically from water held in body cells and other body compartments, causing [[dehydration]] and increased thirst.
{{See also|Diet in diabetes}}
{{-}}
People with diabetes can benefit from education about the disease and treatment, dietary changes, and exercise, with the goal of keeping both short-term and long-term blood glucose levels [[Diabetes management#Glycemic control|within acceptable bounds]]. In addition, given the associated higher risks of cardiovascular disease, lifestyle modifications are recommended to control blood pressure.<ref>{{cite journal | vauthors = Haw JS, Galaviz KI, Straus AN, Kowalski AJ, Magee MJ, Weber MB, Wei J, Narayan KM, Ali MK | display-authors = 3 | title = Long-term Sustainability of Diabetes Prevention Approaches: A Systematic Review and Meta-analysis of Randomized Clinical Trials | journal = JAMA Internal Medicine | volume = 177 | issue = 12 | pages = 1808–1817 | date = December 2017 | pmid = 29114778 | pmc = 5820728 | doi = 10.1001/jamainternmed.2017.6040 }}</ref><ref>{{cite journal | vauthors = Mottalib A, Kasetty M, Mar JY, Elseaidy T, Ashrafzadeh S, Hamdy O | title = Weight Management in Patients with Type 1 Diabetes and Obesity | journal = Current Diabetes Reports | volume = 17 | issue = 10 | pages = 92 | date = August 2017 | pmid = 28836234 | pmc = 5569154 | doi = 10.1007/s11892-017-0918-8 }}</ref>


[[Weight loss]] can prevent progression from prediabetes to [[Diabetes mellitus|diabetes type 2]], decrease the risk of cardiovascular disease, or result in a partial remission in people with diabetes.<ref name="ADA2019">{{cite journal | title = 5. Lifestyle Management: ''Standards of Medical Care in Diabetes-2019'' | journal = Diabetes Care | volume = 42 | issue = Suppl 1 | pages = S46–S60 | date = January 2019 | pmid = 30559231 | doi = 10.2337/dc19-S005 | doi-access = free | author1 = American Diabetes Association }}</ref><ref name="ADA2018">{{cite journal | vauthors = Evert AB, Dennison M, Gardner CD, Garvey WT, Lau KH, MacLeod J, Mitri J, Pereira RF, Rawlings K, Robinson S, Saslow L, Uelmen S, Urbanski PB, Yancy WS | display-authors = 3 | title = Nutrition Therapy for Adults With Diabetes or Prediabetes: A Consensus Report | journal = Diabetes Care | volume = 42 | issue = 5 | pages = 731–754 | date = May 2019 | pmid = 31000505 | pmc = 7011201 | doi = 10.2337/dci19-0014 | type = Professional society guidelines | doi-access = free }}</ref> No single dietary pattern is best for all people with diabetes.<ref name=Em2015/> Healthy dietary patterns, such as the [[Mediterranean diet]], [[low-carbohydrate diet]], or [[DASH diet]], are often recommended, although evidence does not support one over the others.<ref name="ADA2019" /><ref name="ADA2018" /> According to the ADA, "reducing overall carbohydrate intake for individuals with diabetes has demonstrated the most evidence for improving glycemia", and for individuals with type 2 diabetes who cannot meet the glycemic targets or where reducing anti-glycemic medications is a priority, [[low-carbohydrate diet|low or very-low carbohydrate diet]]s are a viable approach.<ref name="ADA2018" /> For overweight people with type 2 diabetes, any diet that achieves weight loss is effective.<ref name=Em2015>{{cite journal | vauthors = Emadian A, Andrews RC, England CY, Wallace V, Thompson JL | title = The effect of macronutrients on glycaemic control: a systematic review of dietary randomised controlled trials in overweight and obese adults with type 2 diabetes in which there was no difference in weight loss between treatment groups | journal = The British Journal of Nutrition | volume = 114 | issue = 10 | pages = 1656–1666 | date = November 2015 | pmid = 26411958 | pmc = 4657029 | doi = 10.1017/S0007114515003475 }}</ref><ref>{{cite journal | vauthors = Grams J, Garvey WT | title = Weight Loss and the Prevention and Treatment of Type 2 Diabetes Using Lifestyle Therapy, Pharmacotherapy, and Bariatric Surgery: Mechanisms of Action | journal = Current Obesity Reports | volume = 4 | issue = 2 | pages = 287–302 | date = June 2015 | pmid = 26627223 | doi = 10.1007/s13679-015-0155-x | s2cid = 207474124 }}</ref>
==Diagnosis==
{{See also|Glycosylated hemoglobin|Glucose tolerance test}}
{{OGTT}}
Diabetes mellitus is characterized by recurrent or persistent hyperglycemia, and is diagnosed by demonstrating any one of the following:<ref name="WHO1999-DefDiagClass" />


A 2020 Cochrane systematic review compared several non-nutritive sweeteners to sugar, placebo and a nutritive low-calorie sweetener ([[tagatose]]), but the results were unclear for effects on HbA1c, body weight and adverse events.<ref name=":4">{{Cite journal |last1=Lohner |first1=Szimonetta |last2=Kuellenberg de Gaudry |first2=Daniela |last3=Toews |first3=Ingrid |last4=Ferenci |first4=Tamas |last5=Meerpohl |first5=Joerg J |date=2020-05-25 |editor-last=Cochrane Metabolic and Endocrine Disorders Group |title=Non-nutritive sweeteners for diabetes mellitus |journal=Cochrane Database of Systematic Reviews |volume=2020 |issue=5 |pages=CD012885 |doi=10.1002/14651858.CD012885.pub2 |pmc=7387865 |pmid=32449201}}</ref> The studies included were mainly of very low-certainty and did not report on health-related quality of life, diabetes complications, all-cause mortality or socioeconomic effects.<ref name=":4" />
* Fasting plasma glucose level ≥&nbsp;7.0&nbsp;mmol/L (126&nbsp;mg/dL).
* [[Plasma glucose]] ≥&nbsp;11.1&nbsp;mmol/L (200&nbsp;mg/dL) two hours after a 75&nbsp;g oral glucose load as in a [[glucose tolerance test]].
* Symptoms of hyperglycemia and casual plasma glucose ≥&nbsp;11.1&nbsp;mmol/L (200&nbsp;mg/dL).
* [[Glycated hemoglobin]] (Hb A1C) ≥&nbsp;6.5%.<ref>{{Cite web|work=American Diabetes Association|url=http://care.diabetesjournals.org/content/33/Supplement_1/S3.full|title="Diabetes Care" January 2010|accessdate=2010-01-29}}</ref>


Exercise has demonstrated to impact people’s lives for a better health outcome. However, fear of hypoglycemia can negatively impact exercise view on youth that have been diagnosed with diabetes. Managing insulin, carbohydrate intake, and physical activity becomes a task that drive youth away benefitting from enjoying exercises. With different studies, an understanding of what can be done and applied to the youth population diagnosed with Type 1 Diabetes has been conducted. A study’s aim was to focus on the impact of an exercise education on physical activity. During the length of a 12-month program, youth and their parents participated in 4 education sessions learning about the benefits, safe procedures, glucose control, and physical activity. With a survey conducted in the beginning, youth and parents demonstrated their fear of hypoglycemia. At the end of the program, most of the youth and parents showed confidence on how to manage and handle situations regarding hypoglycemia. In some instances, youth provided feedback that a continuation of the sessions would be beneficial. In two other studies, exercise was the aim to investigate on how it affects adolescents with T1D. In one of those studies, the impact was assessed in the changes of glucose in exercise by how many minutes per day, intensity, duration, and heart rate. Also, glucose was monitored to see changes during exercise, post exercise, and overnight. The other study investigated how types of exercises can affect glucose levels. The exercise types were continuous moderate exercise and interval-high-intensity exercise. Both types consisted of 2 sets of 10-minute work at different pedaling paces. The continuous pedaled at a 50% and had a 5-minute passive recovery. The high-intensity pedaled at 150% for 15 seconds and was intermixed with a 30-second passive recovery.<ref>{{Cite journal |last1=Parent |first1=Cassandra |last2=Lespagnol |first2=Elodie |last3=Berthoin |first3=Serge |last4=Tagougui |first4=Sémah |last5=Stuckens |first5=Chantal |last6=Tonoli |first6=Cajsa |last7=Dupire |first7=Michelle |last8=Dewaele |first8=Aline |last9=Dereumetz |first9=Julie |last10=Dewast |first10=Chloé |last11=Gueorgieva |first11=Iva |last12=Rabasa-Lhoret |first12=Rémi |last13=Heyman |first13=Elsa |date=April 2024 |title=Continuous moderate and intermittent high-intensity exercise in youth with type 1 diabetes: Which protection for dysglycemia? |url=https://linkinghub.elsevier.com/retrieve/pii/S0168822724001219 |journal=Diabetes Research and Clinical Practice |volume=210 |pages=111631 |doi=10.1016/j.diabres.2024.111631 |issn=0168-8227}}</ref> So, when studies finished collecting data and were able to analyze it, the following were the results. For the studies comparing the different intensities, it was seen that insulin and carbohydrate intake did not have a significant difference before or after exercise. In regards of glucose content, there was a greater drop of blood glucose post exercise in the high intensity (-1.47mmol/L). During recovery, the continuous exercise showed a greater decrease in blood glucose. With all these, continuous exercise resulted in being more favorable for managing blood glucose levels. In the other study, it is mentioned that exercise also contributed to a notable impact on glucose levels. Post-exercise measurements, there was a low mean glucose level that occurred 12 to 16 hours after exercising. Although, with participants exercising for longer sessions (≥90 minutes), hypoglycemia rates were higher. With all these, participants showed well-managed glucose control by intaking proper carbohydrates amount without any insulin adjustments.<ref>{{Cite journal |last1=Sherr |first1=Jennifer L. |last2=Bergford |first2=Simon |last3=Gal |first3=Robin L. |last4=Clements |first4=Mark A. |last5=Patton |first5=Susana R. |last6=Calhoun |first6=Peter |last7=Beaulieu |first7=Lindsey C. |last8=Riddell |first8=Michael C. |date=2024-05-01 |title=Exploring Factors That Influence Postexercise Glycemia in Youth With Type 1 Diabetes in the Real World: The Type 1 Diabetes Exercise Initiative Pediatric (T1DEXIP) Study |url=https://diabetesjournals.org/care/article/47/5/849/154296/Exploring-Factors-That-Influence-Postexercise |journal=Diabetes Care |language=en |volume=47 |issue=5 |pages=849–857 |doi=10.2337/dc23-2212 |issn=0149-5992}}</ref> Lastly, the study, that educated youth and parents about exercise important and management of hypoglycemia, showed many youths feeling confident to continue to exercise regularly and being able to manage their glucose levels.<ref>{{Cite journal |last1=Tanenbaum |first1=Molly L. |last2=Addala |first2=Ananta |last3=Hanes |first3=Sarah |last4=Ritter |first4=Victor |last5=Bishop |first5=Franziska K. |last6=Cortes |first6=Ana L. |last7=Pang |first7=Erica |last8=Hood |first8=Korey K. |last9=Maahs |first9=David M. |last10=Zaharieva |first10=Dessi P. |date=2024-01-01 |title="It changed everything we do": A mixed methods study of youth and parent experiences with a pilot exercise education intervention following new diagnosis of type 1 diabetes |journal=Journal of Diabetes and Its Complications |volume=38 |issue=1 |pages=108651 |doi=10.1016/j.jdiacomp.2023.108651 |issn=1056-8727 |pmc=10843536 |pmid=38043358}}</ref> Therefore, as important as exercising is, showing youth and parents that being physical active is possible. That can be done in specific intensities and with proper understanding on how to handle glucose control over time.
A positive result, in the absence of unequivocal hyperglycemia, should be confirmed by a repeat of any of the above-listed methods on a different day. It is preferable to measure a fasting glucose level because of the ease of measurement and the considerable time commitment of formal glucose tolerance testing, which takes two hours to complete and offers no prognostic advantage over the fasting test.<ref>{{Cite journal|author=Saydah SH, Miret M, Sung J, Varas C, Gause D, Brancati FL |title=Postchallenge hyperglycemia and mortality in a national sample of U.S. adults |journal=Diabetes Care |volume=24 |issue=8 |pages=1397–402 |year=2001 |month=August |pmid=11473076 |doi=10.2337/diacare.24.8.1397}}</ref> According to the current definition, two fasting glucose measurements above 126&nbsp;mg/dL (7.0&nbsp;mmol/L) is considered diagnostic for diabetes mellitus.


=== Diabetes and youth ===
People with fasting glucose levels from 100 to 125&nbsp;mg/dL (5.6 to 6.9&nbsp;mmol/L) are considered to have [[impaired fasting glycemia|impaired fasting glucose]]. Patients with plasma glucose at or above 140&nbsp;mg/dL (7.8&nbsp;mmol/L), but not over 200&nbsp;mg/dL (11.1&nbsp;mmol/L), two hours after a 75 g oral glucose load are considered to have [[impaired glucose tolerance]]. Of these two pre-diabetic states, the latter in particular is a major risk factor for progression to full-blown diabetes mellitus as well as cardiovascular disease.<ref>{{Cite web|author=Santaguida PL, Balion C, Hunt D, Morrison K, Gerstein H, Raina P, Booker L, Yazdi H|url=http://www.ahrq.gov/clinic/epcsums/impglusum.htm|title=Diagnosis, Prognosis, and Treatment of Impaired Glucose Tolerance and Impaired Fasting Glucose|work=Summary of Evidence Report/Technology Assessment, No. 128|publisher=[[Agency for Healthcare Research and Quality]]|accessdate=2008-07-20}}</ref>
Youth dealing with diabetes face unique challenges. These can include the emotional, psychological, and social implications as a result of managing a chronic condition at such a young age. Both forms of diabetes can have long-term risks for complications like cardiovascular disease, kidney damage, and nerve damage. This is why early intervention and impactful management important to improving long-term health. Physical activity plays a vital role in managing diabetes, improving glycemic control, and enhancing the overall quality of life for children and adolescents.


Younger children and adolescents with T1D tend to be more physically active compared to older individuals. This possibly because of the more demanding schedules and sedentary lifestyles of older adolescents, who are often in high school or university. This age-related decrease in physical activity is a potential challenge to keeping up with the ideal healthy lifestyle. <ref>{{Cite journal |last=Kaza |last2=Tsentidis |last3=Vlachopapadopoulou |last4=Karanasios |last5=Ikbale Sakou |last6=Paltoglou |last7=Mastorakos |last8=Karavanaki |first=Maria |first2=Charalampos |first3=Elpis |first4=Spyridon |first5=Irine |first6=George |first7=George |first8=Kyriaki |date=21 April 2023 |title=The impact of physical activity, quality of life and eating habits on cardiometabolic profile and adipokines in youth with T1D |url=https://research.ebsco.com/c/knpbi4/search/details/v5sdvyundn?q=The%20impact%20of%20physical%20activity%2C%20quality%20of%20life%20and%20eating%20habits%20on%20cardiometabolic%20profile%20and%20adipokines%20in%20youth%20with%20T1D |journal= |pages=12 |via=Ebsco}}</ref> People who have had T1D for a longer amount of time also have a tendency to be less active. As diabetes progresses, people may face more barriers to engaging in physical activity. Examples of this could include anxiety about experiencing hypoglycemic events during exercise or the physical challenges posed by the long-term complications that diabetes cause. Increased physical activity in youth with T1D can be associated with improved health. These outcomes can include better lipid profiles (higher HDL-C and lower triglycerides), healthier body composition (reduced waist circumference and BMI), and improved overall physical health. These benefits are especially important during childhood and adolescence because this is when proper growth and development are occurring.
==Management==
{{Main|Diabetes management}}
Diabetes mellitus is a [[chronic disease]] which cannot be cured except in very specific situations. Management concentrates on keeping blood sugar levels as close to normal ("euglycemia") as possible, without causing hypoglycemia. This can usually be accomplished with diet, exercise, and use of appropriate medications (insulin in the case of type 1 diabetes, oral medications as well as possibly insulin in type 2 diabetes).


Younger people with type 2 diabetes have a tendency to have lower levels of physical activity and CRF compared to their peers without diabetes. This contributes to their poorer overall health and increases the risk of cardiovascular and metabolic complications.<ref>{{Cite journal |last=Shaibi |last2=Michaliszyn |last3=Fritschi |last4=Quinn |first=Gabriel Q. |first2=Sara B |first3=Cynthia |first4=Lauretta |date=October 31, 2009 |title=Type 2 diabetes in youth: A phenotype of poor cardiorespiratory fitnessand low physical activity |url=https://research.ebsco.com/c/knpbi4/viewer/pdf/sj64tivtc5 |journal= |pages=7 |via=Ebscoe}}</ref> Despite recommendations for physical activity as part of diabetes management, many youth and young adolesents with type 2 diabetes do not meet the guidelines, hindering their ability to effectively manage blood glucose levels and improve their health. CRF is a key health indicator. Higher levels of CRF is associated with better health outcomes. This means that increasing CRF through exercise can provide important benefits for managing type 2 diabetes. There is a need for targeted interventions that promote physical activity and improve CRF in youth with type 2 diabetes to help reduce the risk of long-term complications.
Patient education, understanding, and participation is vital since the complications of diabetes are far less common and less severe in people who have well-managed blood sugar levels.<ref>{{Cite journal|author=Nathan DM, Cleary PA, Backlund JY, ''et al.'' |title=Intensive diabetes treatment and cardiovascular disease in patients with type 1 diabetes |journal=The New England Journal of Medicine |volume=353 |issue=25 |pages=2643–53 |year=2005 |month=December |pmid=16371630 |pmc=2637991 |doi=10.1056/NEJMoa052187}}</ref><ref>{{Cite journal|author= |title=The effect of intensive diabetes therapy on the development and progression of neuropathy. The Diabetes Control and Complications Trial Research Group |journal=Annals of Internal Medicine |volume=122 |issue=8 |pages=561–8 |year=1995 |month=April |pmid=7887548 |url=http://www.annals.org/cgi/pmidlookup?view=long&pmid=7887548 |doi= 10.1059/0003-4819-122-8-199504150-00001 |doi_brokendate= 2009-10-31}}</ref> The goal of treatment is an HbA1C level of 6.5%, but should not be lower than that, and may be set higher.<ref name=NICE66/> Attention is also paid to other health problems that may accelerate the deleterious effects of diabetes. These include [[tobacco smoking|smoking]], [[hypercholesterolemia|elevated cholesterol]] levels, [[obesity]], [[hypertension|high blood pressure]], and lack of regular [[exercise]].<ref name=NICE66>{{NICE|66|Type 2 diabetes|2008}}</ref>


When it comes to resistance training, it is found to have no significant effect on insulin sensitivity in children and adolescents, despite it having positive trends. <ref>{{Cite journal |last=Burns |last2=Fu |last3=Zhang |first=Ryan D. |first2=You |first3=Peng |date=April 2019 |title=Resistance Training and Insulin Sensitivity in Youth: A Meta-analysis |url=https://research.ebsco.com/c/knpbi4/search/details/56j7mdrgu5?limiters=None&q=Resistance%20Training%20and%20Insulin%20Sensitivity%20in%20Youth%3A%20A%20Meta-analysis |journal= |pages=16 |via=Ebsco}}</ref> Intervention length, training intensity, and the participants' physical maturation might explain the mixed results. Longer and higher-intensity programs showed more promising results. Future research could focus on more dire metabolic conditions like type II diabetes, investigate the role of physical maturation, and think about including longer intervention periods. While resistance training complements aerobic exercise, its standalone effects on insulin sensitivity remain unclear.
===Lifestyle===
{{See also|Diabetic diet}}
There are roles for patient education, dietetic support, sensible exercise, with the goal of keeping both short-term and long-term blood glucose levels [[Diabetes management#Glycemic control|within acceptable bounds]]. In addition, given the associated higher risks of cardiovascular disease, lifestyle modifications are recommended to control blood pressure.<ref>{{Cite journal|author=Adler AI, Stratton IM, Neil HA, ''et al.'' |title=Association of systolic blood pressure with macrovascular and microvascular complications of type 2 diabetes (UKPDS 36): prospective observational study |journal=BMJ |volume=321 |issue=7258 |pages=412–9 |year=2000 |month=August |pmid=10938049 |pmc=27455 |doi=10.1136/bmj.321.7258.412}}</ref>


===Medications===
===Medications===
{{Main|Diabetes medication}}
;Oral medications
{{Main|Anti-diabetic medication}}
[[Metformin]] is generally recommended as a first line treatment for type 2 diabetes as there is good evidence that it decreases mortality.<ref name=AFP09>{{cite journal|last=Ripsin|first=CM|coauthors=Kang, H, Urban, RJ|title=Management of blood glucose in type 2 diabetes mellitus|journal=American family physician|date=2009-01-01|volume=79|issue=1|pages=29–36|pmid=19145963}}</ref> Routine use of [[aspirin]] however has not been found to improve outcomes in uncomplicated diabetes.<ref>{{Cite journal|author=Pignone M, Alberts MJ, Colwell JA, ''et al.'' |title=Aspirin for primary prevention of cardiovascular events in people with diabetes: a position statement of the American Diabetes Association, a scientific statement of the American Heart Association, and an expert consensus document of the American College of Cardiology Foundation |journal=Diabetes Care |volume=33 |issue=6 |pages=1395–402 |year=2010 |month=June |pmid=20508233 |pmc=2875463 |doi=10.2337/dc10-0555 |url=}}</ref>


====Glucose control====
;Insulin
{{see also|Anti-diabetic medication}}
{{Main|Insulin therapy}}
Most medications used to treat diabetes act by lowering [[glucose|blood sugar levels]] through different mechanisms. There is broad consensus that when people with diabetes maintain tight glucose control – keeping the glucose levels in their blood within normal ranges – they experience fewer complications, such as [[diabetic nephropathy|kidney problems]] or [[diabetic retinopathy|eye problems]].<ref>{{cite journal | vauthors = Rosberger DF | title = Diabetic retinopathy: current concepts and emerging therapy | journal = Endocrinology and Metabolism Clinics of North America | volume = 42 | issue = 4 | pages = 721–745 | date = December 2013 | pmid = 24286948 | doi = 10.1016/j.ecl.2013.08.001 }}</ref><ref>{{cite journal | vauthors = MacIsaac RJ, Jerums G, Ekinci EI | title = Glycemic Control as Primary Prevention for Diabetic Kidney Disease | journal = Advances in Chronic Kidney Disease | volume = 25 | issue = 2 | pages = 141–148 | date = March 2018 | pmid = 29580578 | doi = 10.1053/j.ackd.2017.11.003 }}</ref> There is, however, debate as to whether this is appropriate and [[cost effective]] for people later in life in whom the risk of hypoglycemia may be more significant.<ref name=Pozzilli2014>{{cite journal | vauthors = Pozzilli P, Strollo R, Bonora E | title = One size does not fit all glycemic targets for type 2 diabetes | journal = Journal of Diabetes Investigation | volume = 5 | issue = 2 | pages = 134–141 | date = March 2014 | pmid = 24843750 | pmc = 4023573 | doi = 10.1111/jdi.12206 }}</ref>
Type&nbsp;1 diabetes is typically treated with a combinations of regular and NPH [[insulin]], or synthetic [[insulin analogs]]. When [[insulin]] is used in type&nbsp;2 diabetes, a long-acting formulation is usually added initially, while continuing oral medications.<ref name=AFP09/> Doses of insulin are then increased to effect.<ref name=AFP09/>


There are a number of different classes of anti-diabetic medications. Type&nbsp;1 diabetes requires treatment with [[insulin]], ideally using a "basal bolus" regimen that most closely matches normal insulin release: long-acting insulin for the [[basal rate]] and short-acting insulin with meals.<ref name=NICENG17>{{cite web |title=Type 1 diabetes in adults: diagnosis and management |url=https://www.nice.org.uk/guidance/ng17 |website=www.nice.org.uk |publisher=National Institute for Health and Care Excellence |date=26 August 2015 |access-date=25 December 2020 |archive-date=10 December 2020 |archive-url=https://web.archive.org/web/20201210211840/https://www.nice.org.uk/guidance/NG17 |url-status=live }}</ref> Type 2 diabetes is generally treated with medication that is taken by mouth (e.g. [[metformin]]) although some eventually require injectable treatment with insulin or [[GLP-1 agonist]]s.<ref name=NICENG28>{{cite web |title=Type 2 diabetes in adults: management |url=https://www.nice.org.uk/guidance/ng28 |website=www.nice.org.uk |publisher=National Institute for Health and Care Excellence |date=2 December 2015 |access-date=25 December 2020 |archive-date=22 December 2020 |archive-url=https://web.archive.org/web/20201222155551/https://www.nice.org.uk/guidance/ng28 |url-status=live }}</ref>
===Support===
In countries using a [[general practitioner]] system, such as the [[United Kingdom]], care may take place mainly outside hospitals, with hospital-based specialist care used only in case of complications, difficult blood sugar control, or research projects. In other circumstances, general practitioners and specialists share care of a patient in a team approach. [[Optometry|Optometrists]], [[podiatry|podiatrists]]/chiropodists, [[dietitian]]s, [[Physical therapy|physiotherapists]], nursing specialists (e.g., DSNs (Diabetic Specialist Nurse)), [[nurse practitioner]]s, or [[certified diabetes educator]]s, may jointly provide multidisciplinary expertise.{{Citation needed|date=June 2011}}


[[Metformin]] is generally recommended as a first-line treatment for type&nbsp;2 diabetes, as there is good evidence that it decreases mortality.<ref name=AFP09>{{cite journal | vauthors = Ripsin CM, Kang H, Urban RJ | title = Management of blood glucose in type 2 diabetes mellitus | journal = American Family Physician | volume = 79 | issue = 1 | pages = 29–36 | date = January 2009 | pmid = 19145963 | url = http://www.aafp.org/afp/2009/0101/p29.pdf | url-status = live | archive-url = https://web.archive.org/web/20130505033552/http://www.aafp.org/afp/2009/0101/p29.pdf | archive-date = 2013-05-05 }}</ref> It works by decreasing the liver's production of glucose, and increasing the amount of glucose stored in peripheral tissue.<ref name=Drugs2005>{{cite journal | vauthors = Krentz AJ, Bailey CJ | title = Oral antidiabetic agents: current role in type 2 diabetes mellitus | journal = Drugs | volume = 65 | issue = 3 | pages = 385–411 | date = 2005 | pmid = 15669880 | doi = 10.2165/00003495-200565030-00005 | s2cid = 29670619 }}</ref> Several other groups of drugs, mainly oral medication, may also decrease blood sugar in type 2 diabetes. These include agents that increase insulin release ([[sulfonylurea]]s), agents that decrease absorption of sugar from the intestines ([[acarbose]]), agents that inhibit the enzyme dipeptidyl peptidase-4 (DPP-4) that inactivates incretins such as GLP-1 and GIP ([[sitagliptin]]), agents that make the body more sensitive to insulin ([[thiazolidinedione]]) and agents that increase the excretion of glucose in the urine ([[SGLT2 inhibitor]]s).<ref name=Drugs2005/> When insulin is used in type 2 diabetes, a long-acting formulation is usually added initially, while continuing oral medications.<ref name=AFP09/>
==Complications==
{{Main|Complications of diabetes mellitus}}
Diabetes doubles the risk of vascular problems, including [[cardiovascular disease]].<ref>{{Cite web|url=http://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2810%2960484-9/fulltext |title=Diabetes mellitus, fasting blood glucose concentration, and risk of vascular disease: a collaborative meta-analysis of 102 prospective studies : The Lancet |work= |accessdate=}}</ref>


Some severe cases of type 2 diabetes may also be treated with insulin, which is increased gradually until glucose targets are reached.<ref name="AFP09" /><ref>{{Citation| author1 = Consumer Reports| author2-link = American College of Physicians| author2 = American College of Physicians| date = April 2012| title = Choosing a type 2 diabetes drug – Why the best first choice is often the oldest drug| publisher = [[Consumer Reports]]| work = High Value Care| url = http://consumerhealthchoices.org/wp-content/uploads/2012/04/High-Value-Care-Diabetes-ACP.pdf| access-date = August 14, 2012| url-status=live| archive-url = https://web.archive.org/web/20140702223552/http://consumerhealthchoices.org/wp-content/uploads/2012/04/High-Value-Care-Diabetes-ACP.pdf| archive-date = July 2, 2014| author1-link = Consumer Reports}}</ref>
[[Glycated hemoglobin]] is better than [[fasting glucose]] for determining risks of cardiovascular disease and death from any cause.<ref>{{cite journal |author=Selvin E, Steffes MW, Zhu H ''et al'' |title=Glycated hemoglobin, diabetes, and cardiovascular risk in nondiabetic adults |journal=N. Engl. J. Med. |volume=362 |issue=9 |pages=800–11 |year=2010 |pmid=20200384 |pmc=2872990 |doi=10.1056/NEJMoa0908359}}</ref>


====Blood pressure lowering====
==Epidemiology==
[[Cardiovascular disease]] is a serious complication associated with diabetes, and many international guidelines recommend blood pressure treatment targets that are lower than 140/90&nbsp;mmHg for people with diabetes.<ref>{{cite journal | vauthors = Mitchell S, Malanda B, Damasceno A, Eckel RH, Gaita D, Kotseva K, Januzzi JL, Mensah G, Plutzky J, Prystupiuk M, Ryden L, Thierer J, Virani SS, Sperling L | display-authors = 3 | title = A Roadmap on the Prevention of Cardiovascular Disease Among People Living With Diabetes | journal = Global Heart | volume = 14 | issue = 3 | pages = 215–240 | date = September 2019 | pmid = 31451236 | doi = 10.1016/j.gheart.2019.07.009 | doi-access = free }}</ref> However, there is only limited evidence regarding what the lower targets should be. A 2016 systematic review found potential harm to treating to targets lower than 140 mmHg,<ref>{{cite journal | vauthors = Brunström M, Carlberg B | title = Effect of antihypertensive treatment at different blood pressure levels in patients with diabetes mellitus: systematic review and meta-analyses | journal = BMJ | volume = 352 | pages = i717 | date = February 2016 | pmid = 26920333 | pmc = 4770818 | doi = 10.1136/bmj.i717 }}</ref> and a subsequent systematic review in 2019 found no evidence of additional benefit from blood pressure lowering to between 130 – 140mmHg, although there was an increased risk of adverse events.<ref>{{cite journal | vauthors = Brunström M, Carlberg B | title = Benefits and harms of lower blood pressure treatment targets: systematic review and meta-analysis of randomised placebo-controlled trials | journal = BMJ Open | volume = 9 | issue = 9 | pages = e026686 | date = September 2019 | pmid = 31575567 | pmc = 6773352 | doi = 10.1136/bmjopen-2018-026686 }}</ref>
[[File:Diabetes world map - 2000.svg|thumb|Prevalence of diabetes worldwide in 2000 (per 1000 inhabitants). World average was 2.8%.
<div class="references-small" style="-moz-column-count:2; column-count:2;">
{{legend|#b3b3b3|no data}}
{{legend|#ffff65|≤&nbsp;7.5}}
{{legend|#fff200|7.5–15}}
{{legend|#ffdc00|15–22.5}}
{{legend|#ffc600|22.5–30}}
{{legend|#ffb000|30–37.5}}
{{legend|#ff9a00|37.5–45}}
{{legend|#ff8400|45–52.5}}
{{legend|#ff6e00|52.5–60}}
{{legend|#ff5800|60–67.5}}
{{legend|#ff4200|67.5–75}}
{{legend|#ff2c00|75–82.5}}
{{legend|#cb0000|≥&nbsp;82.5}}</div>]]
[[Image:Diabetes mellitus world map - DALY - WHO2004.svg|thumb|[[Disability-adjusted life year]] for diabetes mellitus per 100,000&nbsp;inhabitants in 2004.
<div class="references-small" style="-moz-column-count:2; column-count:2;">
{{legend|#b3b3b3|no data}}
{{legend|#ffff65|<100}}
{{legend|#fff200|100-200}}
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{{legend|#ffc600|300-400}}
{{legend|#ffb000|400-500}}
{{legend|#ff9a00|500-600}}
{{legend|#ff8400|600-700}}
{{legend|#ff6e00|700-800}}
{{legend|#ff5800|800-900}}
{{legend|#ff4200|900-1000}}
{{legend|#ff2c00|1000-1500}}
{{legend|#cb0000|>1500}}
</div>]]


2015 American Diabetes Association recommendations are that people with diabetes and albuminuria should receive an inhibitor of the renin-angiotensin system to reduce the risks of progression to end-stage renal disease, cardiovascular events, and death.<ref name=":0">{{cite journal | vauthors = Fox CS, Golden SH, Anderson C, Bray GA, Burke LE, de Boer IH, Deedwania P, Eckel RH, Ershow AG, Fradkin J, Inzucchi SE, Kosiborod M, Nelson RG, Patel MJ, Pignone M, Quinn L, Schauer PR, Selvin E, Vafiadis DK | display-authors = 3 | title = Update on Prevention of Cardiovascular Disease in Adults With Type 2 Diabetes Mellitus in Light of Recent Evidence: A Scientific Statement From the American Heart Association and the American Diabetes Association | journal = Diabetes Care | volume = 38 | issue = 9 | pages = 1777–1803 | date = September 2015 | pmid = 26246459 | pmc = 4876675 | doi = 10.2337/dci15-0012 }}</ref> There is some evidence that [[angiotensin converting enzyme inhibitors]] (ACEIs) are superior to other inhibitors of the renin-angiotensin system such as [[angiotensin receptor blockers]] (ARBs),<ref>{{cite journal | vauthors = Cheng J, Zhang W, Zhang X, Han F, Li X, He X, Li Q, Chen J | display-authors = 3 | title = Effect of angiotensin-converting enzyme inhibitors and angiotensin II receptor blockers on all-cause mortality, cardiovascular deaths, and cardiovascular events in patients with diabetes mellitus: a meta-analysis | journal = JAMA Internal Medicine | volume = 174 | issue = 5 | pages = 773–785 | date = May 2014 | pmid = 24687000 | doi = 10.1001/jamainternmed.2014.348 | doi-access = free }}</ref> or [[aliskiren]] in preventing cardiovascular disease.<ref>{{cite journal | vauthors = Zheng SL, Roddick AJ, Ayis S | title = Effects of aliskiren on mortality, cardiovascular outcomes and adverse events in patients with diabetes and cardiovascular disease or risk: A systematic review and meta-analysis of 13,395 patients | journal = Diabetes & Vascular Disease Research | volume = 14 | issue = 5 | pages = 400–406 | date = September 2017 | pmid = 28844155 | pmc = 5600262 | doi = 10.1177/1479164117715854 }}</ref> Although a more recent review found similar effects of ACEIs and ARBs on major cardiovascular and renal outcomes.<ref name=":1">{{cite journal | vauthors = Catalá-López F, Macías Saint-Gerons D, González-Bermejo D, Rosano GM, Davis BR, Ridao M, Zaragoza A, Montero-Corominas D, Tobías A, de la Fuente-Honrubia C, Tabarés-Seisdedos R, Hutton B |author5-link=Barry R. Davis| display-authors = 3 | title = Cardiovascular and Renal Outcomes of Renin-Angiotensin System Blockade in Adult Patients with Diabetes Mellitus: A Systematic Review with Network Meta-Analyses | journal = PLOS Medicine | volume = 13 | issue = 3 | pages = e1001971 | date = March 2016 | pmid = 26954482 | pmc = 4783064 | doi = 10.1371/journal.pmed.1001971 |doi-access=free }}</ref> There is no evidence that combining ACEIs and ARBs provides additional benefits.<ref name=":1" />
In 2000, according to the World Health Organization, at least 171 million people worldwide suffer from diabetes, or 2.8% of the population.<ref name="Wild2004"/> Its incidence is increasing rapidly, and it is estimated that by 2030, this number will almost double.<ref name="Wild2004" /> Diabetes mellitus occurs throughout the world, but is more common (especially type&nbsp;2) in the more developed countries. The greatest increase in prevalence is, however, expected to occur in Asia and Africa, where most patients will probably be found by 2030.<ref name="Wild2004" /> The increase in incidence of diabetes in developing countries follows the trend of urbanization and lifestyle changes, perhaps most importantly a "Western-style" diet. This has suggested an environmental (i.e., dietary) effect, but there is little understanding of the mechanism(s) at present, though there is much speculation, some of it most compellingly presented.<ref name="Wild2004" />


==== Aspirin ====
For at least 20 years, diabetes rates in North America have been increasing substantially. In 2010 nearly 26 million people have diabetes in the United States alone, from those 7 million people remain undiagnosed. Another 57 million people are estimated to have pre-diabetes.<ref>[http://www.cdc.gov/media/releases/2011/p0126_diabetes.html CDC.gov]</ref>
The use of [[aspirin]] to prevent cardiovascular disease in diabetes is controversial.<ref name=":0" /> Aspirin is recommended by some in people at high risk of cardiovascular disease; however, routine use of aspirin has not been found to improve outcomes in uncomplicated diabetes.<ref>{{cite journal | vauthors = Pignone M, Alberts MJ, Colwell JA, Cushman M, Inzucchi SE, Mukherjee D, Rosenson RS, Williams CD, Wilson PW, Kirkman MS | display-authors = 3 | title = Aspirin for primary prevention of cardiovascular events in people with diabetes: a position statement of the American Diabetes Association, a scientific statement of the American Heart Association, and an expert consensus document of the American College of Cardiology Foundation | journal = Diabetes Care | volume = 33 | issue = 6 | pages = 1395–1402 | date = June 2010 | pmid = 20508233 | pmc = 2875463 | doi = 10.2337/dc10-0555 }}</ref> 2015 American Diabetes Association recommendations for aspirin use (based on expert consensus or clinical experience) are that low-dose aspirin use is reasonable in adults with diabetes who are at intermediate risk of cardiovascular disease (10-year cardiovascular disease risk, 5–10%).<ref name=":0" /> National guidelines for England and Wales by the [[National Institute for Health and Care Excellence]] (NICE) recommend against the use of aspirin in people with type 1 or type 2 diabetes who do not have confirmed cardiovascular disease.<ref name=NICENG17/><ref name=NICENG28/>


===Surgery===
The [[Centers for Disease Control]] has termed the change an [[epidemic]].<ref>{{Cite web|url=http://www.cdc.gov/Diabetes/news/docs/010126.htm|title=CDC's Diabetes Program-News and Information-Press Releases-October 26, 2000|work=|accessdate=2008-06-23}}</ref> The [[National Diabetes Information Clearinghouse]] estimates that diabetes costs $132 billion in the United States alone every year. About 5%–10% of diabetes cases in North America are type&nbsp;1, with the rest being type&nbsp;2. The fraction of type&nbsp;1 in other parts of the world differs. Most of this difference is not currently understood. The American Diabetes Association cite the 2003 assessment of the National Center for Chronic Disease Prevention and Health Promotion (Centers for Disease Control and Prevention) that 1 in 3 Americans born after 2000 will develop diabetes in their lifetime.<ref>{{Cite journal|author=Narayan KM, Boyle JP, Thompson TJ, Sorensen SW, Williamson DF |title=Lifetime risk for diabetes mellitus in the United States |journal=JAMA |volume=290 |issue=14 |pages=1884–90 |year=2003 |month=October |pmid=14532317 |doi=10.1001/jama.290.14.1884}}</ref><ref name="AA2005-Stats">{{Cite web|author=American Diabetes Association|year=2005|url=http://www.diabetes.org/diabetes-statistics/prevalence.jsp|title=Total Prevalence of Diabetes & Pre-diabetes|accessdate=2006-03-17 |archiveurl = http://web.archive.org/web/20060208032127/http://www.diabetes.org/diabetes-statistics/prevalence.jsp <!-- Bot retrieved archive --> |archivedate = 2006-02-08}}</ref>
[[Bariatric surgery|Weight loss surgery]] in those with [[obesity]] and type 2 diabetes is often an effective measure.<ref name="Picot2009">{{cite journal |vauthors=Picot J, Jones J, Colquitt JL, Gospodarevskaya E, Loveman E, Baxter L, Clegg AJ |date=September 2009 |title=The clinical effectiveness and cost-effectiveness of bariatric (weight loss) surgery for obesity: a systematic review and economic evaluation |journal=Health Technology Assessment |volume=13 |issue=41 |pages=1–190, 215–357, iii–iv |doi=10.3310/hta13410 |pmid=19726018 |doi-access=free |hdl=10536/DRO/DU:30064294|hdl-access=free }}</ref> Many are able to maintain normal blood sugar levels with little or no medications following surgery<ref>{{cite journal | vauthors = Frachetti KJ, Goldfine AB | title = Bariatric surgery for diabetes management | journal = Current Opinion in Endocrinology, Diabetes and Obesity | volume = 16 | issue = 2 | pages = 119–124 | date = April 2009 | pmid = 19276974 | doi = 10.1097/MED.0b013e32832912e7 | s2cid = 31797748 | doi-access = free }}</ref> and long-term mortality is decreased.<ref name=Schum2009/> There is, however, a short-term mortality risk of less than 1% from the surgery.<ref>{{cite journal | vauthors = Colucci RA | title = Bariatric surgery in patients with type 2 diabetes: a viable option | journal = Postgraduate Medicine | volume = 123 | issue = 1 | pages = 24–33 | date = January 2011 | pmid = 21293081 | doi = 10.3810/pgm.2011.01.2242 | s2cid = 207551737 }}</ref> The [[body mass index]] cutoffs for when surgery is appropriate are not yet clear.<ref name=Schum2009>{{cite journal | vauthors = Schulman AP, del Genio F, Sinha N, Rubino F | title = "Metabolic" surgery for treatment of type 2 diabetes mellitus | journal = Endocrine Practice | volume = 15 | issue = 6 | pages = 624–631 | date = September–October 2009 | pmid = 19625245 | doi = 10.4158/EP09170.RAR }}</ref> It is recommended that this option be considered in those who are unable to get both their weight and blood sugar under control.<ref>{{cite journal | vauthors = Dixon JB, le Roux CW, Rubino F, Zimmet P | title = Bariatric surgery for type 2 diabetes | journal = Lancet | volume = 379 | issue = 9833 | pages = 2300–2311 | date = June 2012 | pmid = 22683132 | doi = 10.1016/S0140-6736(12)60401-2 | s2cid = 5198462 }}</ref>


A [[pancreas transplant]] is occasionally considered for people with type&nbsp;1 diabetes who have severe complications of their disease, including [[Chronic kidney disease|end stage kidney disease]] requiring [[kidney transplantation]].<ref>{{cite web|title=Pancreas Transplantation|url=http://www.diabetes.org/living-with-diabetes/treatment-and-care/transplantation/pancreas-transplantation.html|publisher=American Diabetes Association|access-date=9 April 2014|url-status=dead|archive-url=https://web.archive.org/web/20140413123750/http://www.diabetes.org/living-with-diabetes/treatment-and-care/transplantation/pancreas-transplantation.html|archive-date=13 April 2014}}</ref>
According to the American Diabetes Association, approximately 18.3% (8.6 million) of Americans age 60 and older have diabetes.<ref name="dlife">{{Cite web|title=Seniors and Diabetes|work =Elderly And Diabetes-Diabetes and Seniors|url=http://www.dlife.com/dLife/do/ShowContent/daily_living/seniors/|year=2006|publisher=LifeMed Media|accessdate=2007-05-14}}</ref> Diabetes mellitus prevalence increases with age, and the numbers of older persons with diabetes are expected to grow as the elderly population increases in number. The National Health and Nutrition Examination Survey (NHANES III) demonstrated that, in the population over 65 years old, 18% to 20% have diabetes, with 40% having either diabetes or its precursor form of [[impaired glucose tolerance]].<ref name="health">{{Cite journal|author=Harris MI, Flegal KM, Cowie CC, ''et al.'' |title=Prevalence of diabetes, impaired fasting glucose, and impaired glucose tolerance in U.S. adults. The Third National Health and Nutrition Examination Survey, 1988–1994 |journal=Diabetes Care |volume=21 |issue=4 |pages=518–24 |year=1998 |month=April |pmid=9571335 |doi=10.2337/diacare.21.4.518}}</ref>


[[Diabetic neuropathy|Diabetic peripheral neuropathy]] (DPN) affects 30% of all diabetes patients.<ref>{{cite journal |vauthors=Sun J, Wang Y, Zhang X, Zhu S, He H |date=October 2020 |title=Prevalence of peripheral neuropathy in patients with diabetes: A systematic review and meta-analysis |url= |journal=Prim Care Diabetes |volume=14 |issue=5 |pages=435–444 |doi=10.1016/j.pcd.2019.12.005 |pmid=31917119}}</ref> When DPN is superimposed with [[Nerve compression syndrome|nerve compression]], DPN may be treatable with multiple [[Nerve decompression|nerve decompressions]].<ref>{{cite journal |vauthors=Xu L, Sun Z, Casserly E, Nasr C, Cheng J, Xu J |date=June 2022 |title=Advances in Interventional Therapies for Painful Diabetic Neuropathy: A Systematic Review |url= |journal=Anesth Analg |volume=134 |issue=6 |pages=1215–1228 |doi=10.1213/ANE.0000000000005860 |pmc=9124666 |pmid=35051958}}</ref><ref name=":11">{{cite journal |vauthors=Tu Y, Lineaweaver WC, Chen Z, Hu J, Mullins F, Zhang F |date=March 2017 |title=Surgical Decompression in the Treatment of Diabetic Peripheral Neuropathy: A Systematic Review and Meta-analysis |url= |journal=J Reconstr Microsurg |volume=33 |issue=3 |pages=151–157 |doi=10.1055/s-0036-1594300 |pmid=27894152}}</ref> The theory is that DPN predisposes [[Peripheral nervous system|peripheral nerves]] to compression at anatomical sites of narrowing, and that the majority of DPN symptoms are actually attributable to nerve compression, a treatable condition, rather than DPN itself.<ref>{{cite journal |vauthors=Dellon AL |date=February 1988 |title=A cause for optimism in diabetic neuropathy |url= |journal=Ann Plast Surg |volume=20 |issue=2 |pages=103–5 |doi=10.1097/00000637-198802000-00001 |pmid=3355053}}</ref><ref name=":12">{{cite journal |vauthors=Sessions J, Nickerson DS |date=March 2014 |title=Biologic Basis of Nerve Decompression Surgery for Focal Entrapments in Diabetic Peripheral Neuropathy |url= |journal=J Diabetes Sci Technol |volume=8 |issue=2 |pages=412–418 |doi=10.1177/1932296814525030 |pmc=4455405 |pmid=24876595}}</ref> The surgery is associated with lower [[Pain scale|pain scores]], higher [[two-point discrimination]] (a measure of sensory improvement), lower rate of [[Ulcer|ulcerations]], fewer falls (in the case of lower extremity decompression), and fewer [[Amputation|amputations]].<ref name=":12" /><ref>{{cite journal |vauthors=Fadel ZT, Imran WM, Azhar T |date=August 2022 |title=Lower Extremity Nerve Decompression for Diabetic Peripheral Neuropathy: A Systematic Review and Meta-analysis |url= |journal=Plast Reconstr Surg Glob Open |volume=10 |issue=8 |pages=e4478 |doi=10.1097/GOX.0000000000004478 |pmc=9390809 |pmid=35999882}}</ref><ref>{{cite journal |vauthors=Xu L, Sun Z, Casserly E, Nasr C, Cheng J, Xu J |date=June 2022 |title=Advances in Interventional Therapies for Painful Diabetic Neuropathy: A Systematic Review |url= |journal=Anesth Analg |volume=134 |issue=6 |pages=1215–1228 |doi=10.1213/ANE.0000000000005860 |pmc=9124666 |pmid=35051958}}</ref><ref name=":11" />
Indigenous populations in first world countries have a higher prevalence and increasing incidence of diabetes than their corresponding non-indigenous populations. In Australia the age-standardised prevalence of self-reported diabetes in Indigenous Australians is almost 4 times that of non-indigenous Australians.<ref>{{Cite web|author=Australian Institute for Health and Welfare|url=http://www.aihw.gov.au/indigenous/health/diabetes.cfm|title=Diabetes, an overview|accessdate=2008-06-23 |archiveurl = http://web.archive.org/web/20080617222036/http://www.aihw.gov.au/indigenous/health/diabetes.cfm <!-- Bot retrieved archive --> |archivedate = 2008-06-17}}</ref> Preventative community health programs such as [[Sugar Man (diabetes education)]] are showing some success in tackling this problem.


===Self-management and support===
==Etymology==
In countries using a [[general practitioner]] system, such as the United Kingdom, care may take place mainly outside hospitals, with hospital-based specialist care used only in case of complications, difficult blood sugar control, or research projects. In other circumstances, general practitioners and specialists share care in a team approach. Evidence has shown that social prescribing led to slight improvements in blood sugar control for people with type 2 diabetes.<ref>{{Cite journal |title=Can social prescribing improve the health of people with diabetes? |url=https://evidence.nihr.ac.uk/alert/can-social-prescribing-improve-the-health-of-people-with-diabetes/ |access-date=26 January 2024 |website=National Institute for Health and Care Research – NIHR Evidence |date=2024 |doi=10.3310/nihrevidence_61876 |s2cid=267264134 |archive-date=26 January 2024 |archive-url=https://web.archive.org/web/20240126130722/https://evidence.nihr.ac.uk/alert/can-social-prescribing-improve-the-health-of-people-with-diabetes/ |url-status=live }}</ref> Home [[telehealth]] support can be an effective management technique.<ref name="Polisena">{{cite journal | vauthors = Polisena J, Tran K, Cimon K, Hutton B, McGill S, Palmer K | title = Home telehealth for diabetes management: a systematic review and meta-analysis | journal = Diabetes, Obesity & Metabolism | volume = 11 | issue = 10 | pages = 913–930 | date = October 2009 | pmid = 19531058 | doi = 10.1111/j.1463-1326.2009.01057.x | s2cid = 44260857 }}</ref>


The use of [[technology]] to deliver educational programs for adults with type 2 diabetes includes computer-based self-management interventions to collect for tailored responses to facilitate self-management.<ref name="pal">{{cite journal | vauthors = Pal K, Eastwood SV, Michie S, Farmer AJ, Barnard ML, Peacock R, Wood B, Inniss JD, Murray E | display-authors = 3 | title = Computer-based diabetes self-management interventions for adults with type 2 diabetes mellitus | journal = The Cochrane Database of Systematic Reviews | issue = 3 | pages = CD008776 | date = March 2013 | volume = 2013 | pmid = 23543567 | pmc = 6486319 | doi = 10.1002/14651858.CD008776.pub2 | collaboration = Cochrane Metabolic and Endocrine Disorders Group }}</ref> There is no adequate evidence to support effects on [[cholesterol]], [[blood pressure]], [[Behavior change (public health)|behavioral change]] (such as [[physical activity]] levels and dietary), [[Depression (mood)|depression]], weight and [[Quality of life (healthcare)|health-related quality of life]], nor in other biological, cognitive or emotional outcomes.<ref name=pal/><ref>{{cite journal | vauthors = Wei I, Pappas Y, Car J, Sheikh A, Majeed A | title = Computer-assisted versus oral-and-written dietary history taking for diabetes mellitus | journal = The Cochrane Database of Systematic Reviews | issue = 12 | pages = CD008488 | date = December 2011 | volume = 2011 | pmid = 22161430 | pmc = 6486022 | doi = 10.1002/14651858.CD008488.pub2 | collaboration = Cochrane Metabolic and Endocrine Disorders Group }}</ref>
The word “diabetes” ({{IPAc-en|icon|ˌ|d|aɪ|.|ə|ˈ|b|iː|t|iː|z}} or {{IPAc-en|ˌ|d|aɪ|.|ə|ˈ|b|iː|t|ɨ|s}}) comes from [[Latin]] ''diabētēs'', which in turn comes from [[Ancient Greek]] διαβήτης (''diabētēs'') which literally means “a passer through; a [[siphon]].”<ref name=OED_diabetes>Oxford English Dictionary. ''diabetes''. Retrieved 2011-06-10.</ref> [[Ancient Greece|Ancient Greek]] [[physician]] [[Aretaeus of Cappadocia]] ([[Floruit|fl.]] 1st century [[Common Era|CE]]) used that word, with the intended meaning “excessive discharge of urine,” as the name for the disease.<ref name=OnlineEtymology_diabetes>{{Cite web
| last = Harper
| first = Douglas
| title = Online Etymology Dictionary. ''diabetes.''
| year = 2001–2010
| url = http://www.etymonline.com/index.php?search=diabetes&searchmode=none
| accessdate = 2011-06-10
| postscript = <!-- Bot inserted parameter. Either remove it; or change its value to "." for the cite to end in a ".", as necessary. -->{{inconsistent citations}} }}</ref><ref name=RCPE>{{Cite web
| last = Dallas
| first = John
| title = Royal College of Physicians of Edinburgh. Diabetes, Doctors and Dogs: An exhibition on Diabetes and Endocrinology by the College Library for the 43rd St. Andrew's Day Festival Symposium
| year = 2011
| url = http://www.rcpe.ac.uk/library/exhibitions/diabetes/
| accessdate =
| postscript = <!-- Bot inserted parameter. Either remove it; or change its value to "." for the cite to end in a ".", as necessary. -->{{inconsistent citations}} }}</ref> Ultimately, the word comes from Greek διαβαίνειν (''diabainein''), meaning “to pass through,”<ref name=OED_diabetes/> which is composed of δια- (''dia''-), meaning “through” and βαίνειν (''bainein''), meaning “to go”.<ref name=OnlineEtymology_diabetes/> The word “diabetes” is first recorded in English, in the form ''diabete'', in a medical text written around 1425.


==Epidemiology==
The word “''[[wikt:mellitus|mellitus]]''” ({{IPAc-en|m|ɨ|ˈ|l|aɪ|t|ə|s}} or {{IPAc-en|ˈ|m|ɛ|l|ɨ|t|ə|s}}) comes from the classical Latin word ''mellītus'', meaning “mellite”<ref name=OED_mellite>Oxford English Dictionary. ''mellite''. Retrieved 2011-06-10.</ref> (i.e. sweetened with honey;<ref name=OED_mellite/> honey-sweet<ref name=MyEtymology_mellitus>{{Cite web
{{Main|Epidemiology of diabetes}}
| title = MyEtimology. ''mellitus.''
[[File:Prevalence of Diabetes by Percent of Country Population (2014) Gradient Map.png|thumb|upright=1.4|Rates of diabetes worldwide in 2014. The worldwide prevalence was 9.2%.]]
| url = http://www.myetymology.com/latin/mellitus.html
[[File:Diabetes mellitus world map-Deaths per million persons-WHO2012.svg|thumb|upright=1.4|Mortality rate of diabetes worldwide in 2012 per million inhabitants {{Div col|small=yes|colwidth=10em}}{{legend|#ffff20|28–91}}{{legend|#ffe820|92–114}}{{legend|#ffd820|115–141}}{{legend|#ffc020|142–163}}{{legend|#ffa020|164–184}}{{legend|#ff9a20|185–209}}{{legend|#f08015|210–247}}{{legend|#e06815|248–309}}{{legend|#d85010|310–404}}{{legend|#d02010|405–1879}}{{div col end}}]]
| accessdate = 2011-06-10

| postscript = <!-- Bot inserted parameter. Either remove it; or change its value to "." for the cite to end in a ".", as necessary. -->{{inconsistent citations}} }}</ref>). The Latin word comes from ''mell''-, which comes from ''mel'', meaning “honey;<ref name=OED_mellite/><ref name=MyEtymology_mellitus/> sweetness;<ref name=MyEtymology_mellitus/> pleasant thing,<ref name=MyEtymology_mellitus/>” and the suffix -''ītus'',<ref name=OED_mellite/> whose meaning is the same as that of the English suffix “-ite.”<ref name=OED_-ite>Oxford English Dictionary. ''-ite''. Retrieved 2011-06-10.</ref> It was [[Thomas Willis]] who in 1675 added “mellitus” to the word “diabetes” as a designation for the disease, when he noticed that the urine of a diabetic had a sweet taste ([[glycosuria]]).<ref name=RCPE/> This sweet taste had been noticed in urine by the ancient Greeks, Chinese, Egyptians, Indians, and Persians.
In 2017, 425&nbsp;million people had diabetes worldwide,<ref name="IDF2017">{{cite book|vauthors=Elflein J|url=https://www.statista.com/statistics/271442/number-of-diabetics-worldwide/|title=Estimated number diabetics worldwide|date=10 December 2019|access-date=17 May 2020|archive-date=29 July 2020|archive-url=https://web.archive.org/web/20200729234033/https://www.statista.com/statistics/271442/number-of-diabetics-worldwide/|url-status=live}}</ref> up from an estimated 382&nbsp;million people in 2013<ref name=Shi2014>{{cite journal | vauthors = Shi Y, Hu FB | title = The global implications of diabetes and cancer | journal = Lancet | volume = 383 | issue = 9933 | pages = 1947–1948 | date = June 2014 | pmid = 24910221 | doi = 10.1016/S0140-6736(14)60886-2 | s2cid = 7496891 }}</ref> and from 108&nbsp;million in 1980.<ref name=WHO2016>{{cite web |title=Global Report on Diabetes |publisher=World Health Organization |url=http://apps.who.int/iris/bitstream/handle/10665/204871/9789241565257_eng.pdf |access-date=20 September 2018 |date=2016 |archive-date=16 May 2018 |archive-url=https://web.archive.org/web/20180516185526/http://apps.who.int/iris/bitstream/handle/10665/204871/9789241565257_eng.pdf |url-status=live }}</ref> Accounting for the shifting age structure of the global population, the prevalence of diabetes is 8.8% among adults, nearly double the rate of 4.7% in 1980.<ref name=IDF2017/><ref name=WHO2016/> Type&nbsp;2 makes up about 90% of the cases.<ref name=Vos2012>{{cite journal | vauthors = Vos T, Flaxman AD, Naghavi M, Lozano R, Michaud C, Ezzati M, Shibuya K, Salomon JA, Abdalla S, Aboyans V, Abraham J, Ackerman I, Aggarwal R, Ahn SY, Ali MK, Alvarado M, Anderson HR, Anderson LM, Andrews KG, Atkinson C, Baddour LM, Bahalim AN, Barker-Collo S, Barrero LH, Bartels DH, Basáñez MG, Baxter A, Bell ML, Benjamin EJ, Bennett D, Bernabé E, Bhalla K, Bhandari B, Bikbov B, Bin Abdulhak A, Birbeck G, Black JA, Blencowe H, Blore JD, Blyth F, Bolliger I, Bonaventure A, Boufous S, Bourne R, Boussinesq M, Braithwaite T, Brayne C, Bridgett L, Brooker S, Brooks P, Brugha TS, Bryan-Hancock C, Bucello C, Buchbinder R, Buckle G, Budke CM, Burch M, Burney P, Burstein R, Calabria B, Campbell B, Canter CE, Carabin H, Carapetis J, Carmona L, Cella C, Charlson F, Chen H, Cheng AT, Chou D, Chugh SS, Coffeng LE, Colan SD, Colquhoun S, Colson KE, Condon J, Connor MD, Cooper LT, Corriere M, Cortinovis M, de Vaccaro KC, Couser W, Cowie BC, Criqui MH, Cross M, Dabhadkar KC, Dahiya M, Dahodwala N, Damsere-Derry J, Danaei G, Davis A, De Leo D, Degenhardt L, Dellavalle R, Delossantos A, Denenberg J, Derrett S, Des Jarlais DC, Dharmaratne SD, Dherani M, Diaz-Torne C, Dolk H, Dorsey ER, Driscoll T, Duber H, Ebel B, Edmond K, Elbaz A, Ali SE, Erskine H, Erwin PJ, Espindola P, Ewoigbokhan SE, Farzadfar F, Feigin V, Felson DT, Ferrari A, Ferri CP, Fèvre EM, Finucane MM, Flaxman S, Flood L, Foreman K, Forouzanfar MH, Fowkes FG, Franklin R, Fransen M, Freeman MK, Gabbe BJ, Gabriel SE, Gakidou E, Ganatra HA, Garcia B, Gaspari F, Gillum RF, Gmel G, Gosselin R, Grainger R, Groeger J, Guillemin F, Gunnell D, Gupta R, Haagsma J, Hagan H, Halasa YA, Hall W, Haring D, Haro JM, Harrison JE, Havmoeller R, Hay RJ, Higashi H, Hill C, Hoen B, Hoffman H, Hotez PJ, Hoy D, Huang JJ, Ibeanusi SE, Jacobsen KH, James SL, Jarvis D, Jasrasaria R, Jayaraman S, Johns N, Jonas JB, Karthikeyan G, Kassebaum N, Kawakami N, Keren A, Khoo JP, King CH, Knowlton LM, Kobusingye O, Koranteng A, Krishnamurthi R, Lalloo R, Laslett LL, Lathlean T, Leasher JL, Lee YY, Leigh J, Lim SS, Limb E, Lin JK, Lipnick M, Lipshultz SE, Liu W, Loane M, Ohno SL, Lyons R, Ma J, Mabweijano J, MacIntyre MF, Malekzadeh R, Mallinger L, Manivannan S, Marcenes W, March L, Margolis DJ, Marks GB, Marks R, Matsumori A, Matzopoulos R, Mayosi BM, McAnulty JH, McDermott MM, McGill N, McGrath J, Medina-Mora ME, Meltzer M, Mensah GA, Merriman TR, Meyer AC, Miglioli V, Miller M, Miller TR, Mitchell PB, Mocumbi AO, Moffitt TE, Mokdad AA, Monasta L, Montico M, Moradi-Lakeh M, Moran A, Morawska L, Mori R, Murdoch ME, Mwaniki MK, Naidoo K, Nair MN, Naldi L, Narayan KM, Nelson PK, Nelson RG, Nevitt MC, Newton CR, Nolte S, Norman P, Norman R, O'Donnell M, O'Hanlon S, Olives C, Omer SB, Ortblad K, Osborne R, Ozgediz D, Page A, Pahari B, Pandian JD, Rivero AP, Patten SB, Pearce N, Padilla RP, Perez-Ruiz F, Perico N, Pesudovs K, Phillips D, Phillips MR, Pierce K, Pion S, Polanczyk GV, Polinder S, Pope CA, Popova S, Porrini E, Pourmalek F, Prince M, Pullan RL, Ramaiah KD, Ranganathan D, Razavi H, Regan M, Rehm JT, Rein DB, Remuzzi G, Richardson K, Rivara FP, Roberts T, Robinson C, De Leòn FR, Ronfani L, Room R, Rosenfeld LC, Rushton L, Sacco RL, Saha S, Sampson U, Sanchez-Riera L, Sanman E, Schwebel DC, Scott JG, Segui-Gomez M, Shahraz S, Shepard DS, Shin H, Shivakoti R, Singh D, Singh GM, Singh JA, Singleton J, Sleet DA, Sliwa K, Smith E, Smith JL, Stapelberg NJ, Steer A, Steiner T, Stolk WA, Stovner LJ, Sudfeld C, Syed S, Tamburlini G, Tavakkoli M, Taylor HR, Taylor JA, Taylor WJ, Thomas B, Thomson WM, Thurston GD, Tleyjeh IM, Tonelli M, Towbin JA, Truelsen T, Tsilimbaris MK, Ubeda C, Undurraga EA, van der Werf MJ, van Os J, Vavilala MS, Venketasubramanian N, Wang M, Wang W, Watt K, Weatherall DJ, Weinstock MA, Weintraub R, Weisskopf MG, Weissman MM, White RA, Whiteford H, Wiersma ST, Wilkinson JD, Williams HC, Williams SR, Witt E, Wolfe F, Woolf AD, Wulf S, Yeh PH, Zaidi AK, Zheng ZJ, Zonies D, Lopez AD, Murray CJ, AlMazroa MA, Memish ZA | display-authors = 6 | title = Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010 | journal = Lancet | volume = 380 | issue = 9859 | pages = 2163–2196 | date = December 2012 | pmid = 23245607 | pmc = 6350784 | doi = 10.1016/S0140-6736(12)61729-2 }}</ref><ref name=Will2011/> Some data indicate rates are roughly equal in women and men,<ref name=Vos2012/> but male excess in diabetes has been found in many populations with higher type 2 incidence, possibly due to sex-related differences in insulin sensitivity, consequences of obesity and regional body fat deposition, and other contributing factors such as high blood pressure, tobacco smoking, and alcohol intake.<ref>{{cite journal | vauthors = Gale EA, Gillespie KM | title = Diabetes and gender | journal = Diabetologia | volume = 44 | issue = 1 | pages = 3–15 | date = January 2001 | pmid = 11206408 | doi = 10.1007/s001250051573 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Meisinger C, Thorand B, Schneider A, Stieber J, Döring A, Löwel H | title = Sex differences in risk factors for incident type 2 diabetes mellitus: the MONICA Augsburg cohort study | journal = Archives of Internal Medicine | volume = 162 | issue = 1 | pages = 82–89 | date = January 2002 | pmid = 11784224 | doi = 10.1001/archinte.162.1.82 | doi-access = free }}</ref>

The WHO estimates that diabetes resulted in 1.5&nbsp;million deaths in 2012, making it the 8th leading cause of death.<ref name="WHO2013Top10">{{cite web |date=October 2013 |title=The top 10 causes of death Fact sheet N°310 |url=https://www.who.int/mediacentre/factsheets/fs310/en/ |url-status=live |archive-url=https://web.archive.org/web/20170530121727/http://www.who.int/mediacentre/factsheets/fs310/en/ |archive-date=30 May 2017 |publisher=World Health Organization}}</ref><ref name=WHO2016 /> However, another 2.2&nbsp;million deaths worldwide were attributable to high blood glucose and the increased risks of cardiovascular disease and other associated complications (e.g. kidney failure), which often lead to premature death and are often listed as the underlying cause on death certificates rather than diabetes.<ref name=WHO2016 /><ref>Public Health Agency of Canada, ''Diabetes in Canada: Facts and figures from a public health perspective''. Ottawa, 2011.</ref> For example, in 2017, the [[International Diabetes Federation]] (IDF) estimated that diabetes resulted in 4.0&nbsp;million deaths worldwide,<ref name=IDF2017/> using modeling to estimate the total number of deaths that could be directly or indirectly attributed to diabetes.<ref name=IDF2017/>

Diabetes occurs throughout the world but is more common (especially type 2) in more developed countries. The greatest increase in rates has, however, been seen in low- and middle-income countries,<ref name=WHO2016 /> where more than 80% of diabetic deaths occur.<ref>{{cite journal | vauthors = Mathers CD, Loncar D | title = Projections of global mortality and burden of disease from 2002 to 2030 | journal = PLOS Medicine | volume = 3 | issue = 11 | pages = e442 | date = November 2006 | pmid = 17132052 | pmc = 1664601 | doi = 10.1371/journal.pmed.0030442 | doi-access = free }}</ref> The fastest prevalence increase is expected to occur in Asia and Africa, where most people with diabetes will probably live in 2030.<ref name="Wild2004" /> The increase in rates in developing countries follows the trend of urbanization and lifestyle changes, including increasingly sedentary lifestyles, less physically demanding work and the global nutrition transition, marked by increased intake of foods that are high energy-dense but nutrient-poor (often high in sugar and saturated fats, sometimes referred to as the "Western-style" diet).<ref name=WHO2016 /><ref name="Wild2004">{{cite journal | vauthors = Wild S, Roglic G, Green A, Sicree R, King H | title = Global prevalence of diabetes: estimates for the year 2000 and projections for 2030 | journal = Diabetes Care | volume = 27 | issue = 5 | pages = 1047–1053 | date = May 2004 | pmid = 15111519 | doi = 10.2337/diacare.27.5.1047 | doi-access = free }}</ref> The global number of diabetes cases might increase by 48% between 2017 and 2045.<ref name=IDF2017/>

As of 2020, 38% of all US adults had prediabetes.<ref name="CDC 2018">{{cite web | title=Prevalence of Prediabetes Among Adults – Diabetes | website=CDC | date=2018-03-13 | url=https://www.cdc.gov/diabetes/data/statistics-report/prevalence-of-prediabetes.html | access-date=2022-12-15 | archive-date=2023-03-06 | archive-url=https://web.archive.org/web/20230306070935/https://www.cdc.gov/diabetes/data/statistics-report/prevalence-of-prediabetes.html | url-status=live }}</ref> [[Prediabetes]] is an early stage of diabetes.


==History==
==History==
{{Main|History of diabetes}}
Diabetes was one of the first diseases described,<ref>{{cite book| vauthors = Ripoll BC, Leutholtz I |title=Exercise and disease management|publisher=CRC Press|location=Boca Raton|isbn=978-1-4398-2759-8 |page=25 |url=https://books.google.com/books?id=eAn9-bm_pi8C&pg=PA25|edition=2nd|date=2011-04-25|url-status=live|archive-url=https://web.archive.org/web/20160403054841/https://books.google.com/books?id=eAn9-bm_pi8C&pg=PA25|archive-date=2016-04-03 }}</ref> with an [[Ancient Egypt|Egyptian]] manuscript from {{Abbr|c.|circa}} 1500 [[Common Era|BCE]] mentioning "too great emptying of the urine."<ref name=History2010/> The [[Ebers papyrus]] includes a recommendation for a drink to take in such cases.<ref name="Roberts">{{cite magazine|vauthors=Roberts J|title=Sickening sweet|magazine=Distillations|date=2015|volume=1|issue=4|pages=12–15|url=https://www.sciencehistory.org/distillations/magazine/sickening-sweet|access-date=20 March 2018|archive-date=13 November 2019|archive-url=https://web.archive.org/web/20191113141421/https://www.sciencehistory.org/distillations/magazine/sickening-sweet|url-status=live}}</ref> The first described cases are believed to have been type&nbsp;1 diabetes.<ref name=History2010>{{cite book | veditors = Poretsky L |title=Principles of diabetes mellitus|year=2009|publisher=Springer|location=New York|isbn=978-0-387-09840-1|page=3|url=https://books.google.com/books?id=i0qojvF1SpUC&pg=PA3 |edition=2nd |url-status=live |archive-url=https://web.archive.org/web/20160404170919/https://books.google.com/books?id=i0qojvF1SpUC&pg=PA3 |archive-date=2016-04-04}}</ref> Indian physicians around the same time identified the disease and classified it as ''madhumeha'' or "honey urine", noting the urine would attract ants.<ref name=History2010/><ref name="Roberts"/>


The term "diabetes" or "to pass through" was first used in 230&nbsp;BCE by the Greek [[Apollonius (physician)|Apollonius of Memphis]].<ref name=History2010/> The disease was considered rare during the time of the [[Roman empire]], with [[Galen]] commenting he had only seen two cases during his career.<ref name=History2010/> This is possibly due to the diet and lifestyle of the ancients, or because the clinical symptoms were observed during the advanced stage of the disease. Galen named the disease "diarrhea of the urine" (diarrhea urinosa).<ref name="Laios"/>
Diabetes is one of the oldest known diseases.<ref name=RCPE/> An Egyptian manuscript from [[Circa|c.]] 1550 [[Common Era|BCE]] mentions the phrase “the passing of too much urine.”<ref name=RCPE/> The great Indian physician [[Sushruta]] ([[Floruit|fl.]] 6th century [[Common Era|BCE]])<ref name=RCPE/> identified the disease and classified it as ''Medhumeha''.<ref name="Dwivedi" /> He further identified it with [[obesity]] and [[sedentary]] lifestyle, advising exercises to help "cure" it.<ref name="Dwivedi">Dwivedi, Girish & Dwivedi, Shridhar (2007). [http://medind.nic.in/iae/t07/i4/iaet07i4p243.pdf ''History of Medicine: Sushruta – the Clinician – Teacher par Excellence'']. [[National Informatics Centre|National Informatics Centre (Government of India)]].</ref> The ancient [[India]]ns tested for diabetes by observing whether [[ant]]s were attracted to a person's urine, and called the ailment "sweet urine disease" (Madhumeha).


The earliest surviving work with a detailed reference to diabetes is that of [[Aretaeus of Cappadocia]] (2nd or early 3rd{{nbsp}}century CE). He described the symptoms and the course of the disease, which he attributed to the moisture and coldness, reflecting the beliefs of the "[[Pneumatic school|Pneumatic School]]". He hypothesized a correlation between diabetes and other diseases, and he discussed differential diagnosis from the snakebite, which also provokes excessive thirst. His work remained unknown in the West until 1552, when the first Latin edition was published in Venice.<ref name="Laios">{{cite journal | vauthors = Laios K, Karamanou M, Saridaki Z, Androutsos G | title = Aretaeus of Cappadocia and the first description of diabetes | journal = Hormones | volume = 11 | issue = 1 | pages = 109–113 | year = 2012 | pmid = 22450352 | doi = 10.1007/BF03401545 | url = http://www.hormones.gr/pdf/HORMONES%202012,%20109-113.pdf | url-status = live | s2cid = 4730719 | archive-url = https://web.archive.org/web/20170104092212/http://www.hormones.gr/pdf/HORMONES%202012%2C%20109-113.pdf | archive-date = 2017-01-04 }}</ref>
Concerning the sweetness of urine, it is to be noted that the Chinese, Japanese and Korean words for diabetes are based on the same ideographs (糖尿病) which mean "sugar urine disease". It was in 1776 that [[Matthew Dobson]] confirmed that the sweet taste comes from an excess of a kind of sugar in the urine and blood.<ref>{{Cite journal|last=Dobson|first=M.|coauthors=|year=1776|title=Nature of the urine in diabetes|journal=Medical Observations and Inquiries|volume=5|pages=298–310 }}</ref>


Two types of diabetes were identified as separate conditions for the first time by the Indian physicians [[Sushruta]] and [[Charaka]] in 400–500&nbsp;CE with one type being associated with youth and another type with being overweight.<ref name=History2010/> Effective treatment was not developed until the early part of the 20th century when Canadians [[Frederick Banting]] and [[Charles Best (medical scientist)|Charles Best]] isolated and purified insulin in 1921 and 1922.<ref name=History2010/> This was followed by the development of the long-acting insulin [[NPH insulin|NPH]] in the 1940s.<ref name=History2010/>
The first complete clinical description of diabetes was given by the [[Ancient Greece|Ancient Greek]] [[physician]] [[Aretaeus of Cappadocia]] ([[Floruit|fl.]] 1st century [[Common Era|CE]]), who noted the excessive amount of urine which passed through the kidneys and gave the disease the name “diabetes.”<ref name=RCPE/>


===Etymology===
Diabetes mellitus appears to have been a death sentence in the ancient era. Hippocrates makes no mention of it, which may indicate that he felt the disease was incurable. Aretaeus did attempt to treat it but could not give a good prognosis; he commented that "life (with diabetes) is short, disgusting and painful."<ref>{{Cite book|author=Medvei, Victor Cornelius|title=The history of clinical endocrinology|publisher=Parthenon Pub. Group|location=Carnforth, Lancs., U.K|year=1993|pages=23–34|isbn=1-85070-427-9 }}</ref>
The word ''diabetes'' ({{IPAc-en|ˌ|d|aɪ|.|ə|ˈ|b|iː|t|iː|z}} or {{IPAc-en|ˌ|d|aɪ|.|ə|ˈ|b|iː|t|ᵻ|s}}) comes from [[Latin]] {{lang|la|diabētēs}}, which in turn comes from [[Ancient Greek]] {{lang|grc-Grek|[[wikt:διαβήτης|διαβήτης]]|italic=no}} ({{lang|grc-latn|diabētēs}}), which literally means "a passer through; a [[siphon]]".<ref name=OED_diabetes>Oxford English Dictionary. ''diabetes''. Retrieved 2011-06-10.</ref> [[Ancient Greece|Ancient Greek]] physician [[Aretaeus of Cappadocia]] ([[Floruit|fl.]] 1st{{nbsp}}century [[Common Era|CE]]) used that word, with the intended meaning "excessive discharge of urine", as the name for the disease.<ref name=OnlineEtymology_diabetes>{{cite web | vauthors = Harper D |title= Online Etymology Dictionary. ''diabetes.'' |year= 2001–2010 |url= http://www.etymonline.com/index.php?search=diabetes&searchmode=none |access-date= 2011-06-10 |url-status=live |archive-url= https://web.archive.org/web/20120113074242/http://www.etymonline.com/index.php?search=diabetes&searchmode=none |archive-date= 2012-01-13 }}</ref><ref>Aretaeus, ''De causis et signis acutorum morborum (lib. 2)'', [https://www.perseus.tufts.edu/hopper/text?doc=Perseus:abo:tlg,0719,002:2:2&lang=original Κεφ. β. περὶ Διαβήτεω (Chapter 2, ''On Diabetes'', Greek original)] {{webarchive|url=https://web.archive.org/web/20140702232821/http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Aabo%3Atlg%2C0719%2C002%3A2%3A2&lang=original |date=2014-07-02 }}, on Perseus</ref> Ultimately, the word comes from Greek {{lang|el|διαβαίνειν|italic=no}} ({{lang|el-latn|diabainein}}), meaning "to pass through",<ref name=OED_diabetes/> which is composed of {{lang|el|δια|italic=no}}- ({{lang|el-latn|dia}}-), meaning "through" and {{lang|el|βαίνειν|italic=no}} ({{lang|el-latn|bainein}}), meaning "to go".<ref name=OnlineEtymology_diabetes/> The word "diabetes" is first recorded in English, in the form ''diabete'', in a medical text written around 1425.


The word ''[[wikt:mellitus|mellitus]]'' ({{IPAc-en|m|ə|ˈ|l|aɪ|t|ə|s}} or {{IPAc-en|ˈ|m|ɛ|l|ᵻ|t|ə|s}}) comes from the classical Latin word {{lang|la|mellītus}}, meaning "mellite"<ref name=OED_mellite>Oxford English Dictionary. ''mellite''. Retrieved 2011-06-10.</ref> (i.e. sweetened with honey;<ref name=OED_mellite/> honey-sweet<ref name=MyEtymology_mellitus>{{cite web |title=MyEtimology. ''mellitus.'' |url=http://www.myetymology.com/latin/mellitus.html |access-date=2011-06-10 |url-status=usurped |archive-url =https://web.archive.org/web/20110316045914/http://www.myetymology.com/latin/mellitus.html |archive-date=2011-03-16 }}</ref>). The Latin word comes from {{lang|la|mell}}-, which comes from {{lang|la|mel}}, meaning "honey";<ref name=OED_mellite/><ref name=MyEtymology_mellitus/> sweetness;<ref name=MyEtymology_mellitus/> pleasant thing,<ref name=MyEtymology_mellitus/> and the suffix -{{lang|la|ītus}},<ref name=OED_mellite/> whose meaning is the same as that of the English suffix "-ite".<ref name="OED_-ite">Oxford English Dictionary. ''-ite''. Retrieved 2011-06-10.</ref> It was [[Thomas Willis]] who in 1675 added "mellitus" to the word "diabetes" as a designation for the disease, when he noticed the urine of a person with diabetes had a sweet taste (glycosuria). This sweet taste had been noticed in urine by the ancient Greeks, Chinese, Egyptians, and Indians.<ref>{{cite journal|title=Diabetes Urine Testing: An Historical Perspective|last=Guthrie|first=Diana W.|journal=The Diabetes Educator|date=1988|volume=14|issue=6|pages=521–525 |url=https://journals.sagepub.com/doi/abs/10.1177/014572178801400615|doi=10.1177/014572178801400615|pmid=3061764 }}</ref>
In medieval [[History of Iran|Persia]], [[Avicenna]] (980–1037) provided a detailed account on diabetes mellitus in ''[[The Canon of Medicine]]'', "describing the abnormal appetite and the collapse of sexual functions," and he documented the sweet taste of diabetic urine. Like Aretaeus before him, Avicenna recognized a primary and secondary diabetes. He also described diabetic [[gangrene]], and treated diabetes using a mixture of [[lupin]]e, [[trigonella]] ([[fenugreek]]), and [[zedoary]] seed, which produces a considerable reduction in the excretion of sugar, a treatment which is still prescribed in modern times. Avicenna also "described diabetes insipidus very precisely for the first time", though it was later [[Johann Peter Frank]] (1745–1821) who first differentiated between diabetes mellitus and diabetes insipidus.<ref>{{Cite journal|journal=International Journal of Endocrinology and Metabolism|year=2003|volume=1|pages=43–45 [44–5]|title=Clinical Endocrinology in the Islamic Civilization in Iran|last=Nabipour|first=I.}}</ref>{{Verify source|date=September 2010}}


==Society and culture==
Although diabetes has been recognized since [[ancient history|antiquity]], and treatments of various efficacy have been known in various regions since the [[Middle Ages]], and in [[Snake oil|legend]] for much longer, pathogenesis of diabetes has only been understood experimentally since about 1900.<ref name="FASEBJ2002-Patlak">{{Cite journal|author=Patlak M |title=New weapons to combat an ancient disease: treating diabetes |journal=The FASEB Journal |volume=16 |issue=14 |pages=1853 |year=2002 |month=December |pmid=12468446 |url=http://www.fasebj.org/content/16/14/1853.2}}</ref>
{{Further|List of films featuring diabetes}}
The discovery of a role for the pancreas in diabetes is generally ascribed to [[Joseph von Mering]] and [[Oskar Minkowski]], who in 1889 found that dogs whose pancreas was removed developed all the signs and symptoms of diabetes and died shortly afterwards.<!--
--><ref>{{Cite journal|author=Von Mehring J, Minkowski O.|title=Diabetes mellitus nach pankreasexstirpation|journal=Arch Exp Pathol Pharmakol|year=1890|volume=26|pages=371–387|doi=10.1007/BF01831214|issue=5–6}}</ref>
In 1910, Sir [[Edward Albert Sharpey-Schafer]] suggested that people with diabetes were deficient in a single chemical that was normally produced by the pancreas—he proposed calling this substance ''insulin'', from the Latin ''insula'', meaning island, in reference to the insulin-producing [[islets of Langerhans]] in the pancreas.


The 1989 "[[St. Vincent Declaration]]"<ref>{{Cite book| vauthors = Tulchinsky TH, Varavikova EA |title=The New Public Health, Second Edition|publisher=[[Academic Press]]|year=2008|page=200|location=New York|isbn=978-0-12-370890-8}}</ref><ref>{{cite journal | vauthors = Piwernetz K, Home PD, Snorgaard O, Antsiferov M, Staehr-Johansen K, Krans M | title = Monitoring the targets of the St Vincent Declaration and the implementation of quality management in diabetes care: the DIABCARE initiative. The DIABCARE Monitoring Group of the St Vincent Declaration Steering Committee | journal = Diabetic Medicine | volume = 10 | issue = 4 | pages = 371–377 | date = May 1993 | pmid = 8508624 | doi = 10.1111/j.1464-5491.1993.tb00083.x | s2cid = 9931183 }}</ref> was the result of international efforts to improve the care accorded to those with diabetes. Doing so is important not only in terms of quality of life and life expectancy but also economically{{snd}}expenses due to diabetes have been shown to be a major drain on health{{snd}}and productivity-related resources for healthcare systems and governments.
The endocrine role of the pancreas in metabolism, and indeed the existence of insulin, was not further clarified until 1921, when Sir [[Frederick Grant Banting]] and [[Charles Herbert Best]] repeated the work of Von Mering and Minkowski, and went further to demonstrate they could reverse induced diabetes in dogs by giving them an extract from the pancreatic islets of Langerhans of healthy dogs.<!--
--><ref name="CanadMedAssocJ1922-Banting">{{Cite journal|author=Banting FG, Best CH, Collip JB, Campbell WR, Fletcher AA |title=Pancreatic extracts in the treatment of diabetes mellitus: preliminary report. 1922 |journal=CMAJ |volume=145 |issue=10 |pages=1281–6 |year=1991 |month=November |pmid=1933711 |pmc=1335942}}</ref>
Banting, Best, and colleagues (especially the chemist [[James Collip|Collip]]) went on to purify the hormone insulin from bovine pancreases at the [[University of Toronto]]. This led to the availability of an effective treatment—insulin injections—and the first patient was treated in 1922. For this, Banting and laboratory director MacLeod received the [[Nobel Prize in Physiology or Medicine]] in 1923; both shared their Prize money with others in the team who were not recognized, in particular Best and Collip. Banting and Best made the patent available without charge and did not attempt to control commercial production. [[Insulin]] production and therapy rapidly spread around the world, largely as a result of this decision. Banting is honored by [[World Diabetes Day]] which is held on his birthday, November 14.


Several countries established more and less successful national diabetes programmes to improve treatment of the disease.<ref name="EO005-Dubois&Bankauskaite">{{cite journal |vauthors=Dubois H, Bankauskaite V | title = Type 2 diabetes programmes in Europe | journal = Euro Observer | volume = 7 | issue = 2 | pages = 5–6 | year = 2005 | url = http://www2.lse.ac.uk/LSEHealthAndSocialCare/pdf/euroObserver/Obsvol7no2.pdf | url-status=live | archive-url = https://web.archive.org/web/20121024171754/http://www2.lse.ac.uk/LSEHealthAndSocialCare/pdf/euroObserver/Obsvol7no2.pdf | archive-date = 2012-10-24 }}</ref>
The distinction between what is now known as type&nbsp;1 diabetes and type&nbsp;2 diabetes was first clearly made by Sir [[Harold Percival Himsworth|Harold Percival (Harry) Himsworth]], and published in January 1936.<ref name="Lancet1936-Himsworth">{{Cite journal|author= Himsworth|title=''Diabetes mellitus: its differentiation into insulin-sensitive and insulin-insensitive types|journal= Lancet|year=1936|pages=127–30|volume=i|doi=10.1016/S0140-6736(01)36134-2|issue= 5864}}</ref>


=== Diabetes stigma ===
Despite the availability of treatment, diabetes has remained a major cause of death. For instance, [[statistics]] reveal that the cause-specific [[mortality rate]] during 1927 amounted to about 47.7 per 100,000 population in [[Malta]].<ref>Department of Health (Malta), 1897–1972:Annual Reports.</ref>
Diabetes stigma describes the negative attitudes, judgment, discrimination, or prejudice against people with diabetes. Often, the stigma stems from the idea that diabetes (particularly Type 2 diabetes) resulted from poor lifestyle and unhealthy food choices rather than other causal factors like genetics and social determinants of health.<ref>{{Cite web |last=CDC |date=2022-11-03 |title=Diabetes Stigma: Learn About It, Recognize It, Reduce It |url=https://www.cdc.gov/diabetes/library/features/diabetes_stigma.html |access-date=2023-10-31 |website=Centers for Disease Control and Prevention |archive-date=2023-10-31 |archive-url=https://web.archive.org/web/20231031192432/https://www.cdc.gov/diabetes/library/features/diabetes_stigma.html |url-status=live }}</ref> Manifestation of stigma can be seen throughout different cultures and contexts. Scenarios include diabetes statuses affecting marriage proposals, workplace-employment, and social standing in communities.<ref>{{Cite journal |last1=Schabert |first1=Jasmin |last2=Browne |first2=Jessica L. |last3=Mosely |first3=Kylie |last4=Speight |first4=Jane |date=2013-03-01 |title=Social Stigma in Diabetes |journal=The Patient – Patient-Centered Outcomes Research |volume=6 |issue=1 |pages=1–10 |doi=10.1007/s40271-012-0001-0 |pmid=23322536 |s2cid=207490680 |issn=1178-1661|doi-access=free }}</ref>


Stigma is also seen internally, as people with diabetes can also have negative beliefs about themselves. Often these cases of self-stigma are associated with higher diabetes-specific distress, lower self-efficacy, and poorer provider-patient interactions during diabetes care.<ref>{{Cite journal |last1=Puhl |first1=Rebecca M. |last2=Himmelstein |first2=Mary S. |last3=Hateley-Browne |first3=Jessica L. |last4=Speight |first4=Jane |date=October 2020 |title=Weight stigma and diabetes stigma in U.S. adults with type 2 diabetes: Associations with diabetes self-care behaviors and perceptions of health care |url=https://doi.org/10.1016/j.diabres.2020.108387 |journal=Diabetes Research and Clinical Practice |volume=168 |pages=108387 |doi=10.1016/j.diabres.2020.108387 |pmid=32858100 |s2cid=221366068 |issn=0168-8227}}</ref>
Other landmark discoveries include:<ref name="FASEBJ2002-Patlak" />


=== Racial and economic inequalities ===
* Identification of the first of the [[sulfonylurea]]s in 1942
Racial and ethnic minorities are disproportionately affected with higher prevalence of diabetes compared to non-minority individuals.<ref>{{Cite journal |last1=Spanakis |first1=Elias K. |last2=Golden |first2=Sherita Hill |date=December 2013 |title=Race/Ethnic Difference in Diabetes and Diabetic Complications |journal=Current Diabetes Reports |volume=13 |issue=6 |pages=10.1007/s11892–013–0421–9 |doi=10.1007/s11892-013-0421-9 |issn=1534-4827 |pmc=3830901 |pmid=24037313}}</ref> While US adults overall have a 40% chance of developing type 2 diabetes, Hispanic/Latino adults chance is more than 50%.<ref>{{Cite web |last=CDC |date=2022-04-04 |title=Hispanic/Latino Americans and Type 2 Diabetes |url=https://www.cdc.gov/diabetes/library/features/hispanic-diabetes.html |access-date=2023-10-31 |website=Centers for Disease Control and Prevention |archive-date=2023-10-31 |archive-url=https://web.archive.org/web/20231031192358/https://www.cdc.gov/diabetes/library/features/hispanic-diabetes.html |url-status=live }}</ref> African Americans also are much more likely to be diagnosed with diabetes compared to White Americans. Asians have increased risk of diabetes as diabetes can develop at lower BMI due to differences in visceral fat compared to other races. For Asians, diabetes can develop at a younger age and lower body fat compared to other groups. Additionally, diabetes is highly underreported in Asian American people, as 1 in 3 cases are undiagnosed compared to the average 1 in 5 for the nation.<ref>{{Cite web |last=CDC |date=2022-11-21 |title=Diabetes and Asian American People |url=https://www.cdc.gov/diabetes/library/spotlights/diabetes-asian-americans.html |access-date=2023-10-31 |website=Centers for Disease Control and Prevention |archive-date=2023-10-31 |archive-url=https://web.archive.org/web/20231031192358/https://www.cdc.gov/diabetes/library/spotlights/diabetes-asian-americans.html |url-status=live }}</ref>
* Reintroduction of the use of [[biguanides]] for Type&nbsp;2 diabetes in the late 1950s. The initial [[phenformin]] was withdrawn worldwide (in the U.S. in 1977) due to its potential for sometimes fatal lactic acidosis and [[metformin]] was first marketed in France in 1979, but not until 1994 in the US.
* The determination of the [[amino acid sequence]] of insulin (by Sir [[Frederick Sanger]], for which he received a Nobel Prize)
* The [[radioimmunoassay]] for insulin, as discovered by [[Rosalyn Yalow]] and [[Solomon Berson]] (gaining Yalow the 1977 Nobel Prize in Physiology or Medicine)<ref>{{Cite journal|author=Yalow RS, Berson SA |title=Immunoassay of endogenous plasma insulin in man |journal=The Journal of Clinical Investigation |volume=39 |issue= 7|pages=1157–75 |year=1960 |month=July |pmid=13846364 |pmc=441860 |doi=10.1172/JCI104130}}</ref>
* The three-dimensional structure of insulin ({{PDB|2INS}})
* Dr [[Gerald Reaven]]'s identification of the constellation of symptoms now called [[metabolic syndrome]] in 1988
* Demonstration that intensive glycemic control in type&nbsp;1 diabetes reduces chronic side effects more as glucose levels approach 'normal' in a large longitudinal study,<ref>{{Cite journal|author= |title=The effect of intensive treatment of diabetes on the development and progression of long-term complications in insulin-dependent diabetes mellitus. The Diabetes Control and Complications Trial Research Group |journal=The New England Journal of Medicine |volume=329 |issue=14 |pages=977–86 |year=1993 |month=September |pmid=8366922 |doi=10.1056/NEJM199309303291401 |last1= The Diabetes Control And Complications Trial Research Group | author-separator =, | author-name-separator= }}</ref> and also in type&nbsp;2 diabetics in other large studies
* Identification of the first [[thiazolidinedione]] as an effective insulin sensitizer during the 1990s


People with diabetes who have neuropathic symptoms such as numbness or tingling in feet or hands are twice as likely to be [[unemployed]] as those without the symptoms.<ref name="pmid17563611">{{cite journal | vauthors = Stewart WF, Ricci JA, Chee E, Hirsch AG, Brandenburg NA | title = Lost productive time and costs due to diabetes and diabetic neuropathic pain in the US workforce | journal = Journal of Occupational and Environmental Medicine | volume = 49 | issue = 6 | pages = 672–679 | date = June 2007 | pmid = 17563611 | doi = 10.1097/JOM.0b013e318065b83a | s2cid = 21487348 }}</ref>
In 1980, U.S. biotech company Genentech developed biosynthetic human insulin. The insulin was isolated from genetically altered bacteria (the bacteria contain the human gene for synthesizing synthetic human insulin), which produce large quantities of insulin. The purified insulin is distributed to pharmacies for use by diabetes patients. Initially, this development was not regarded by the medical profession as a clinically meaningful development. However, by 1996, the advent of insulin analogues which had vastly improved [[ADME|absorption, distribution, metabolism, and excretion (ADME)]] characteristics which were clinically meaningful based on this early biotechnology development.


In 2010, diabetes-related emergency room (ER) visit rates in the United States were higher among people from the lowest income communities (526 per 10,000 population) than from the highest income communities (236 per 10,000 population). Approximately 9.4% of diabetes-related ER visits were for the uninsured.<ref name="hcup-us.ahrq">{{cite journal |author1=Washington R.E. |author2=Andrews R.M. |author3=Mutter R.L. |title=Emergency Department Visits for Adults with Diabetes, 2010 |date=November 2013 |website=HCUP Statistical Brief |issue=167 |publisher=Agency for Healthcare Research and Quality |url=http://www.hcup-us.ahrq.gov/reports/statbriefs/sb167.jsp |location=Rockville MD |pmid=24455787 |url-status=live |archive-url=https://web.archive.org/web/20131203011036/http://www.hcup-us.ahrq.gov/reports/statbriefs/sb167.jsp |archive-date=2013-12-03 }}</ref>
==Society and culture==
The 1990 "[[St. Vincent Declaration]]"<ref>{{Cite book|last=Theodore H. Tulchinsky|first=Elena A. Varavikova|title=The New Public Health, Second Edition|publisher=[[Academic Press]]|year=2008|page=200|location=New York|isbn=0-12-370890-7}}</ref><ref>{{Cite journal|author=Piwernetz K, Home PD, Snorgaard O, Antsiferov M, Staehr-Johansen K, Krans M |title=Monitoring the targets of the St Vincent Declaration and the implementation of quality management in diabetes care: the DIABCARE initiative. The DIABCARE Monitoring Group of the St Vincent Declaration Steering Committee |journal=Diabetic Medicine |volume=10 |issue=4 |pages=371–7 |year=1993 |month=May |pmid=8508624 |doi=10.1111/j.1464-5491.1993.tb00083.x}}</ref> was the result of international efforts to improve the care accorded to those with diabetes. Doing so is important both in terms of quality of life and life expectancy but also economically—expenses due to diabetes have been shown to be a major drain on health-and productivity-related resources for healthcare systems and governments.


===Naming===
Several countries established more and less successful national diabetes programmes to improve treatment of the disease.<ref name="EO005-Dubois&Bankauskaite">{{Cite journal|author= Dubois, HFW and Bankauskaite, V|title=Type&nbsp;2 diabetes programmes in Europe|url= http://www.euro.who.int/Document/Obs/EuroObserver7_3.pdf|format=PDF|journal=Euro Observer|year=2005|pages=5–6|volume=7|issue=2}}</ref>
The term "type&nbsp;1 diabetes" has replaced several former terms, including childhood-onset diabetes, juvenile diabetes, and insulin-dependent diabetes mellitus. Likewise, the term "type&nbsp;2 diabetes" has replaced several former terms, including adult-onset diabetes, obesity-related diabetes, and noninsulin-dependent diabetes mellitus. Beyond these two types, there is no agreed-upon standard nomenclature.<ref>{{Cite web|title=Type 1 vs. Type 2 Diabetes Differences: Which One Is Worse?|url=https://www.medicinenet.com/type_1_vs_type_2_diabetes_similarities_differences/article.htm|access-date=2021-03-21|website=MedicineNet|archive-date=2021-04-14|archive-url=https://web.archive.org/web/20210414120708/https://www.medicinenet.com/type_1_vs_type_2_diabetes_similarities_differences/article.htm|url-status=live}}</ref>


Diabetes mellitus is also occasionally known as "sugar diabetes" to differentiate it from [[diabetes insipidus]].<ref>{{cite book| vauthors = Parker K |title= Living with diabetes|date=2008|publisher=Facts On File|location=New York|isbn=978-1-4381-2108-6|page=[https://archive.org/details/livingwithdiabet0000park/page/143 143]|url=https://archive.org/details/livingwithdiabet0000park|url-access=registration}}</ref>
A study shows that diabetic patients with neuropathic symptoms such as [[Paresthesia|numbness]] or tingling in feet or hands are twice as likely to be [[unemployed]] as those without the symptoms.<ref name="pmid17563611">{{Cite journal|author=Stewart WF, Ricci JA, Chee E, Hirsch AG, Brandenburg NA |title=Lost productive time and costs due to diabetes and diabetic neuropathic pain in the US workforce |journal=J. Occup. Environ. Med. |volume=49 |issue=6 |pages=672–9 |year=2007 |month=June |pmid=17563611 |doi=10.1097/JOM.0b013e318065b83a |url=}}</ref>


==References==
==Other animals==
{{main|Diabetes in dogs|Diabetes in cats}}
{{Reflist|2}}


Diabetes can occur in mammals or reptiles.<ref>{{cite journal | vauthors = Niaz K, Maqbool F, Khan F, Hassan FI, Momtaz S, Abdollahi M | title = Comparative occurrence of diabetes in canine, feline, and few wild animals and their association with pancreatic diseases and ketoacidosis with therapeutic approach | journal = Veterinary World | volume = 11 | issue = 4 | pages = 410–422 | date = April 2018 | pmid = 29805204 | pmc = 5960778 | doi = 10.14202/vetworld.2018.410-422 }}</ref><ref>{{cite book | vauthors = Stahl SJ | chapter =Hyperglycemia in Reptiles |date=2006-01-01 | title = Reptile Medicine and Surgery | edition = Second |pages=822–830 | veditors = Mader DR |place=Saint Louis |publisher=W.B. Saunders |doi=10.1016/b0-72-169327-x/50062-6 |isbn=978-0-7216-9327-9 }}</ref> Birds do not develop diabetes because of their unusually high tolerance for elevated blood glucose levels.<ref>{{cite journal | vauthors = Sweazea KL | title = Revisiting glucose regulation in birds - A negative model of diabetes complications | journal = Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology | volume = 262 | pages = 110778 | date = 8 July 2022 | pmid = 35817273 | doi = 10.1016/j.cbpb.2022.110778 | s2cid = 250404382 }}</ref>
==Further reading==
* Furdell, Elizabeth Lane. ''Fatal Thirst: Diabetes in Britain until Insulin'' (Leiden, Netherlands: Brill, 2009) 194 pp.


In animals, diabetes is most commonly encountered in dogs and cats. Middle-aged animals are most commonly affected. Female dogs are twice as likely to be affected as males, while according to some sources, male cats are more prone than females. In both species, all breeds may be affected, but some small dog breeds are particularly likely to develop diabetes, such as [[Poodle|Miniature Poodles]].<ref name=Merck>{{cite web | title=Diabetes mellitus | website= Merck Veterinary Manual | edition = 9th | url=http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/40302.htm | year=2005 | access-date=2011-10-23 | url-status=live | archive-url=https://web.archive.org/web/20110927154816/http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm%2Fbc%2F40302.htm | archive-date=2011-09-27 }}</ref>
==External links==

Feline diabetes is strikingly similar to human type 2 diabetes. The [[Burmese cat|Burmese]], [[Russian Blue]], [[Abyssinian cat|Abyssinian]], and [[Norwegian Forest cat|Norwegian Forest]] cat breeds are at higher risk than other breeds. Overweight cats are also at higher risk.<ref>{{cite book|vauthors=Öhlund M|title=Feline diabetes mellitus Aspects on epidemiology and pathogenesis|publisher=Acta Universitatis agriculturae Sueciae|isbn=978-91-7760-067-1|url=https://pub.epsilon.slu.se/14746/1/ohlund_m_171123.pdf|access-date=2017-12-18|archive-date=2021-04-13|archive-url=https://web.archive.org/web/20210413223918/https://pub.epsilon.slu.se/14746/1/ohlund_m_171123.pdf|url-status=live}}</ref>

The symptoms may relate to fluid loss and polyuria, but the course may also be insidious. Diabetic animals are more prone to infections. The long-term complications recognized in humans are much rarer in animals. The principles of treatment (weight loss, oral antidiabetics, subcutaneous insulin) and management of emergencies (e.g. ketoacidosis) are similar to those in humans.<ref name=Merck/>

== See also ==
* [[Outline of diabetes]]
* [[Diabetic foot]]
* [[Blood glucose monitoring]]

== References ==
{{Reflist}}

== External links ==
{{Sister project links|display=Diabetes mellitus}}
{{Sister project links|display=Diabetes mellitus}}
<!-- BEFORE inserting new links here you should first post it to the talk page, otherwise your edit is likely to be reverted; this section is reserved for official or authoritative resources -->
<!-- BEFORE inserting new links here you should first post it to the talk page, otherwise your edit is likely to be reverted; this section is reserved for official or authoritative resources -->
* [https://www.diabetes.org American Diabetes Association]
* [http://www.dmoz.org/Health/Conditions_and_Diseases/Endocrine_Disorders/Pancreas/Diabetes/ Diabetes] at the [[Open Directory Project]]
* [http://www.diabetes.org/ American Diabetes Association]
* [https://diabetesatlas.org/ IDF Diabetes Atlas]
* [https://www.nei.nih.gov/learn-about-eye-health/resources-for-health-educators/national-eye-health-education-program/nehep-partnership-directory/national-diabetes-education-program National Diabetes Education Program]
* [http://www.diabetesatlas.org/ IDF Diabetes Atlas]
* [https://diabetesjournals.org/care/issue/42/Supplement_1 ADA's Standards of Medical Care in Diabetes 2019]
* [http://www.idf.org/ International Diabetes Federation]
* {{cite journal | vauthors = Polonsky KS | title = The past 200 years in diabetes | journal = The New England Journal of Medicine | volume = 367 | issue = 14 | pages = 1332–1340 | date = October 2012 | pmid = 23034021 | doi = 10.1056/NEJMra1110560 | s2cid = 9456681 | doi-access = free }}
* [http://ndep.nih.gov/ National Diabetes Education Program]
* {{cite web | url = https://medlineplus.gov/diabetes.html | publisher = U.S. National Library of Medicine | work = MedlinePlus | title = Diabetes }}
* [http://www.peersforprogress.org/ Peers for Progress]
* [http://www.worlddiabetesday.org/ World Diabetes Day]


{{Medical condition classification and resources
{{Endocrine pathology}}
| ICD10={{ICD10|E|10||e|10}}–{{ICD10|E|14||e|10}}
{{diabetes}}
| ICD9={{ICD9|250}}
| MedlinePlus=001214
| eMedicineSubj=med
| eMedicineTopic=546
| eMedicine_mult={{eMedicine2|emerg|134}}
| MeSH=D003920|
}}
{{Diabetes}}
{{Disease of the pancreas and glucose metabolism}}
{{Authority control}}


{{DEFAULTSORT:Diabetes Mellitus}}
{{DEFAULTSORT:Diabetes Mellitus}}
[[Category:Diabetes| ]]
[[Category:Diabetes| ]]
[[Category:Medical conditions related to obesity]]
[[Category:Causes of amputation]]
[[Category:Nutrition]]
[[Category:Endocrine diseases]]
[[Category:Metabolic disorders]]

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[[af:Suikersiekte]]
[[am:ስኳር በሽታ]]
[[ar:السكري]]
[[an:Diabetis mellitus]]
[[ast:Diabetes]]
[[az:Şəkərli diabet]]
[[bn:বহুমূত্র রোগ]]
[[zh-min-nan:Thn̂g-jiō-pēⁿ]]
[[be:Цукровы дыябет]]
[[be-x-old:Цукровы дыябэт]]
[[bs:Diabetes mellitus]]
[[br:Diabet]]
[[bg:Захарен диабет]]
[[ca:Diabetis mellitus]]
[[cs:Diabetes mellitus]]
[[cy:Clefyd y siwgr]]
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[[et:Suhkurtõbi]]
[[el:Διαβήτης (ασθένεια)]]
[[es:Diabetes mellitus]]
[[eo:Diabeto]]
[[eu:Diabete]]
[[fa:مرض قند]]
[[fo:Diabetes mellitus]]
[[fr:Diabète sucré]]
[[ga:Diaibéiteas]]
[[gl:Diabetes mellitus]]
[[gu:મધુપ્રમેહ]]
[[ko:당뇨병]]
[[hi:मधुमेह]]
[[hr:Šećerna bolest]]
[[io:Diabeto]]
[[id:Diabetes mellitus]]
[[ia:Diabete]]
[[is:Sykursýki]]
[[it:Diabete mellito]]
[[he:סוכרת]]
[[jv:Kencing Manis]]
[[kn:ಮಧುಮೇಹ]]
[[pam:Diabetes mellitus]]
[[ka:შაქრის დიაბეტი]]
[[kk:Қант диабеті]]
[[sw:Kisukari]]
[[la:Diabetes mellitus]]
[[lv:Cukura diabēts]]
[[lb:Diabetes mellitus]]
[[lt:Cukrinis diabetas]]
[[lij:Diabete Mellìo]]
[[hu:Cukorbetegség]]
[[mk:Шеќерна болест]]
[[ml:പ്രമേഹം]]
[[mr:मधुमेह]]
[[arz:مرض السكر]]
[[ms:Penyakit kencing manis]]
[[mn:Чихрийн шижин]]
[[nl:Diabetes mellitus]]
[[ne:मधुमेह]]
[[new:मधुमेह]]
[[ja:糖尿病]]
[[no:Diabetes mellitus]]
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[[oc:Diabèta sacarina]]
[[om:Diabetes]]
[[pnb:شوگر]]
[[km:ជំងឺទឹកនោមផ្អែម]]
[[pl:Cukrzyca]]
[[pt:Diabetes mellitus]]
[[ro:Diabet zaharat]]
[[qu:Misk'i unquy]]
[[ru:Сахарный диабет]]
[[sq:Diabetes mellitus]]
[[si:දියවැඩියාව]]
[[simple:Diabetes mellitus]]
[[sk:Diabetes mellitus]]
[[sl:Sladkorna bolezen]]
[[so:Sokorow]]
[[ckb:شەکرە]]
[[sr:Шећерна болест]]
[[sh:Dijabetes]]
[[su:Diabétes mélitus]]
[[fi:Diabetes]]
[[sv:Diabetes]]
[[tl:Diabetes mellitus]]
[[ta:நீரிழிவு நோய்]]
[[te:మధుమేహం]]
[[th:เบาหวาน]]
[[tg:Диабети қанд]]
[[tr:Diabetes mellitus]]
[[uk:Цукровий діабет]]
[[ur:ذیابیطس]]
[[vi:Đái tháo đường]]
[[war:Diabetes mellitus]]
[[yi:צוקערקרענק]]
[[zh-yue:糖尿]]
[[bat-smg:Sokraus diabets]]
[[zh:糖尿病]]

Latest revision as of 16:31, 15 November 2024

Diabetes mellitus
A hollow circle with a thick blue border and a clear centre
Universal blue circle symbol for diabetes[1]
Pronunciation
SpecialtyEndocrinology
Symptoms
Complications
  • Metabolic imbalances
  • Cardiovascular diseases
  • Nerve and brain damage
  • Kidney failure
  • Gastrointestinal changes[2][3][4][5]
DurationRemission may occur, but diabetes is often life-long
Types
  • Type 1 diabetes
  • Type 2 diabetes
  • Gestational diabetes
CausesInsulin insufficiency or gradual resistance
Risk factors
Diagnostic method
Differential diagnosisdiabetes insipidus
Treatment
Medication
Frequency463 million (5.7%)[9]
Deaths4.2 million (2019)[9]

Diabetes mellitus, often known simply as diabetes, is a group of common endocrine diseases characterized by sustained high blood sugar levels.[10][11] Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body becoming unresponsive to the hormone's effects.[12] Classic symptoms include thirst, polyuria, weight loss, and blurred vision. If left untreated, the disease can lead to various health complications, including disorders of the cardiovascular system, eye, kidney, and nerves.[3] Diabetes accounts for approximately 4.2 million deaths every year,[9] with an estimated 1.5 million caused by either untreated or poorly treated diabetes.[10]

The major types of diabetes are type 1 and type 2.[13] The most common treatment for type 1 is insulin replacement therapy (insulin injections), while anti-diabetic medications (such as metformin and semaglutide) and lifestyle modifications can be used to manage type 2. Gestational diabetes, a form that arises during pregnancy in some women, normally resolves shortly after delivery.

As of 2021, an estimated 537 million people had diabetes worldwide accounting for 10.5% of the adult population, with type 2 making up about 90% of all cases. The World Health Organization has reported that diabetes was "among the top 10 causes of death in 2021, following a significant percentage increase of 95% since 2000."[14] It is estimated that by 2045, approximately 783 million adults, or 1 in 8, will be living with diabetes, representing a 46% increase from the current figures.[15] The prevalence of the disease continues to increase, most dramatically in low- and middle-income nations.[16] Rates are similar in women and men, with diabetes being the seventh leading cause of death globally.[17][18] The global expenditure on diabetes-related healthcare is an estimated US$760 billion a year.[19]

Signs and symptoms

[edit]
Overview of the most significant symptoms of diabetes
Retinopathy, nephropathy, and neuropathy are potential complications of diabetes

The classic symptoms of untreated diabetes are polyuria, thirst, and weight loss.[20] Several other non-specific signs and symptoms may also occur, including fatigue, blurred vision, sweet smelling urine/semen and genital itchiness due to Candida infection.[20] About half of affected individuals may also be asymptomatic.[20] Type 1 presents abruptly following a pre-clinical phase, while type 2 has a more insidious onset; patients may remain asymptomatic for many years.[21]

Diabetic ketoacidosis is a medical emergency that occurs most commonly in type 1, but may also occur in type 2 if it has been longstanding or if the individual has significant β-cell dysfunction.[22] Excessive production of ketone bodies leads to signs and symptoms including nausea, vomiting, abdominal pain, the smell of acetone in the breath, deep breathing known as Kussmaul breathing, and in severe cases decreased level of consciousness.[22] Hyperosmolar hyperglycemic state is another emergency characterized by dehydration secondary to severe hyperglycemia, with resultant hypernatremia leading to an altered mental state and possibly coma.[23]

Hypoglycemia is a recognized complication of insulin treatment used in diabetes.[24] An acute presentation can include mild symptoms such as sweating, trembling, and palpitations, to more serious effects including impaired cognition, confusion, seizures, coma, and rarely death.[24] Recurrent hypoglycemic episodes may lower the glycemic threshold at which symptoms occur, meaning mild symptoms may not appear before cognitive deterioration begins to occur.[24]

Long-term complications

[edit]

The major long-term complications of diabetes relate to damage to blood vessels at both macrovascular and microvascular levels.[25][26] Diabetes doubles the risk of cardiovascular disease, and about 75% of deaths in people with diabetes are due to coronary artery disease.[27] Other macrovascular morbidities include stroke and peripheral artery disease.[28]

Microvascular disease affects the eyes, kidneys, and nerves.[25] Damage to the retina, known as diabetic retinopathy, is the most common cause of blindness in people of working age.[20] The eyes can also be affected in other ways, including development of cataract and glaucoma.[20] It is recommended that people with diabetes visit an optometrist or ophthalmologist once a year.[29]

Diabetic nephropathy is a major cause of chronic kidney disease, accounting for over 50% of patients on dialysis in the United States.[30] Diabetic neuropathy, damage to nerves, manifests in various ways, including sensory loss, neuropathic pain, and autonomic dysfunction (such as postural hypotension, diarrhoea, and erectile dysfunction).[20] Loss of pain sensation predisposes to trauma that can lead to diabetic foot problems (such as ulceration), the most common cause of non-traumatic lower-limb amputation.[20]

Hearing loss is another long-term complication associated with diabetes.[31]

Based on extensive data and numerous cases of gallstone disease, it appears that a causal link might exist between type 2 diabetes and gallstones. People with diabetes are at a higher risk of developing gallstones compared to those without diabetes.[32]

There is a link between cognitive deficit and diabetes; studies have shown that diabetic individuals are at a greater risk of cognitive decline, and have a greater rate of decline compared to those without the disease.[33] The condition also predisposes to falls in the elderly, especially those treated with insulin.[34]

Causes

[edit]
Comparison of type 1 and 2 diabetes[35]
Feature Type 1 diabetes Type 2 diabetes
Onset Sudden Gradual
Age at onset Any age; average age at diagnosis being 24.[36] Mostly in adults
Body size Thin or normal[37] Often obese
Ketoacidosis Common Rare
Autoantibodies Usually present Absent
Endogenous insulin Low or absent Normal, decreased
or increased
Heritability 0.69 to 0.88[38][39][40] 0.47 to 0.77[41]
Prevalence

(age standardized)

<2 per 1,000[42] ~6% (men), ~5% (women)[43]

Diabetes is classified by the World Health Organization into six categories: type 1 diabetes, type 2 diabetes, hybrid forms of diabetes (including slowly evolving, immune-mediated diabetes of adults and ketosis-prone type 2 diabetes), hyperglycemia first detected during pregnancy, "other specific types", and "unclassified diabetes".[44] Diabetes is a more variable disease than once thought, and individuals may have a combination of forms.[45]

Type 1

[edit]

Type 1 accounts for 5 to 10% of diabetes cases and is the most common type diagnosed in patients under 20 years;[46] however, the older term "juvenile-onset diabetes" is no longer used as onset in adulthood is not unusual.[30] The disease is characterized by loss of the insulin-producing beta cells of the pancreatic islets, leading to severe insulin deficiency, and can be further classified as immune-mediated or idiopathic (without known cause).[46] The majority of cases are immune-mediated, in which a T cell-mediated autoimmune attack causes loss of beta cells and thus insulin deficiency.[47] Patients often have irregular and unpredictable blood sugar levels due to very low insulin and an impaired counter-response to hypoglycemia.[48]

Autoimmune attack in type 1 diabetes.

Type 1 diabetes is partly inherited, with multiple genes, including certain HLA genotypes, known to influence the risk of diabetes. In genetically susceptible people, the onset of diabetes can be triggered by one or more environmental factors,[49] such as a viral infection or diet. Several viruses have been implicated, but to date there is no stringent evidence to support this hypothesis in humans.[49][50]

Type 1 diabetes can occur at any age, and a significant proportion is diagnosed during adulthood. Latent autoimmune diabetes of adults (LADA) is the diagnostic term applied when type 1 diabetes develops in adults; it has a slower onset than the same condition in children. Given this difference, some use the unofficial term "type 1.5 diabetes" for this condition. Adults with LADA are frequently initially misdiagnosed as having type 2 diabetes, based on age rather than a cause.[51] LADA leaves adults with higher levels of insulin production than type 1 diabetes, but not enough insulin production for healthy blood sugar levels.[52][53]

Type 2

[edit]
Reduced insulin secretion or weaker effect of insulin on its receptor leads to high glucose content in the blood.

Type 2 diabetes is characterized by insulin resistance, which may be combined with relatively reduced insulin secretion.[12] The defective responsiveness of body tissues to insulin is believed to involve the insulin receptor.[54] However, the specific defects are not known. Diabetes mellitus cases due to a known defect are classified separately. Type 2 diabetes is the most common type of diabetes mellitus accounting for 95% of diabetes.[2] Many people with type 2 diabetes have evidence of prediabetes (impaired fasting glucose and/or impaired glucose tolerance) before meeting the criteria for type 2 diabetes.[55] The progression of prediabetes to overt type 2 diabetes can be slowed or reversed by lifestyle changes or medications that improve insulin sensitivity or reduce the liver's glucose production.[56]

Type 2 diabetes is primarily due to lifestyle factors and genetics.[57] A number of lifestyle factors are known to be important to the development of type 2 diabetes, including obesity (defined by a body mass index of greater than 30), lack of physical activity, poor diet, stress, and urbanization.[35][58] Excess body fat is associated with 30% of cases in people of Chinese and Japanese descent, 60–80% of cases in those of European and African descent, and 100% of Pima Indians and Pacific Islanders.[12] Even those who are not obese may have a high waist–hip ratio.[12]

Dietary factors such as sugar-sweetened drinks are associated with an increased risk.[59][60] The type of fats in the diet is also important, with saturated fat and trans fats increasing the risk and polyunsaturated and monounsaturated fat decreasing the risk.[57] Eating white rice excessively may increase the risk of diabetes, especially in Chinese and Japanese people.[61] Lack of physical activity may increase the risk of diabetes in some people.[62]

Adverse childhood experiences, including abuse, neglect, and household difficulties, increase the likelihood of type 2 diabetes later in life by 32%, with neglect having the strongest effect.[63]

Antipsychotic medication side effects (specifically metabolic abnormalities, dyslipidemia and weight gain) are also potential risk factors.[64]

Gestational diabetes

[edit]

Gestational diabetes resembles type 2 diabetes in several respects, involving a combination of relatively inadequate insulin secretion and responsiveness. It occurs in about 2–10% of all pregnancies and may improve or disappear after delivery.[65] It is recommended that all pregnant women get tested starting around 24–28 weeks gestation.[66] It is most often diagnosed in the second or third trimester because of the increase in insulin-antagonist hormone levels that occurs at this time.[66] However, after pregnancy approximately 5–10% of women with gestational diabetes are found to have another form of diabetes, most commonly type 2.[65] Gestational diabetes is fully treatable, but requires careful medical supervision throughout the pregnancy. Management may include dietary changes, blood glucose monitoring, and in some cases, insulin may be required.[67]

Though it may be transient, untreated gestational diabetes can damage the health of the fetus or mother. Risks to the baby include macrosomia (high birth weight), congenital heart and central nervous system abnormalities, and skeletal muscle malformations. Increased levels of insulin in a fetus's blood may inhibit fetal surfactant production and cause infant respiratory distress syndrome. A high blood bilirubin level may result from red blood cell destruction. In severe cases, perinatal death may occur, most commonly as a result of poor placental perfusion due to vascular impairment. Labor induction may be indicated with decreased placental function. A caesarean section may be performed if there is marked fetal distress[68] or an increased risk of injury associated with macrosomia, such as shoulder dystocia.[69]

Other types

[edit]

Maturity onset diabetes of the young (MODY) is a rare autosomal dominant inherited form of diabetes, due to one of several single-gene mutations causing defects in insulin production.[70] It is significantly less common than the three main types, constituting 1–2% of all cases. The name of this disease refers to early hypotheses as to its nature. Being due to a defective gene, this disease varies in age at presentation and in severity according to the specific gene defect; thus, there are at least 13 subtypes of MODY. People with MODY often can control it without using insulin.[71]

Some cases of diabetes are caused by the body's tissue receptors not responding to insulin (even when insulin levels are normal, which is what separates it from type 2 diabetes); this form is very uncommon. Genetic mutations (autosomal or mitochondrial) can lead to defects in beta cell function. Abnormal insulin action may also have been genetically determined in some cases. Any disease that causes extensive damage to the pancreas may lead to diabetes (for example, chronic pancreatitis and cystic fibrosis). Diseases associated with excessive secretion of insulin-antagonistic hormones can cause diabetes (which is typically resolved once the hormone excess is removed). Many drugs impair insulin secretion and some toxins damage pancreatic beta cells, whereas others increase insulin resistance (especially glucocorticoids which can provoke "steroid diabetes"). The ICD-10 (1992) diagnostic entity, malnutrition-related diabetes mellitus (ICD-10 code E12), was deprecated by the World Health Organization (WHO) when the current taxonomy was introduced in 1999.[72] Yet another form of diabetes that people may develop is double diabetes. This is when a type 1 diabetic becomes insulin resistant, the hallmark for type 2 diabetes or has a family history for type 2 diabetes.[73] It was first discovered in 1990 or 1991.

The following is a list of disorders that may increase the risk of diabetes:[74]

Pathophysiology

[edit]
The fluctuation of blood sugar (red) and the sugar-lowering hormone insulin (blue) in humans during the course of a day with three meals. One of the effects of a sugar-rich vs a starch-rich meal is highlighted.
Mechanism of insulin release in normal pancreatic beta cells. Insulin production is more or less constant within the beta cells. Its release is triggered by food, chiefly food containing absorbable glucose.

Insulin is the principal hormone that regulates the uptake of glucose from the blood into most cells of the body, especially liver, adipose tissue and muscle, except smooth muscle, in which insulin acts via the IGF-1.[76] Therefore, deficiency of insulin or the insensitivity of its receptors play a central role in all forms of diabetes mellitus.[77]

The body obtains glucose from three main sources: the intestinal absorption of food; the breakdown of glycogen (glycogenolysis), the storage form of glucose found in the liver; and gluconeogenesis, the generation of glucose from non-carbohydrate substrates in the body.[78] Insulin plays a critical role in regulating glucose levels in the body. Insulin can inhibit the breakdown of glycogen or the process of gluconeogenesis, it can stimulate the transport of glucose into fat and muscle cells, and it can stimulate the storage of glucose in the form of glycogen.[78]

Insulin is released into the blood by beta cells (β-cells), found in the islets of Langerhans in the pancreas, in response to rising levels of blood glucose, typically after eating. Insulin is used by about two-thirds of the body's cells to absorb glucose from the blood for use as fuel, for conversion to other needed molecules, or for storage. Lower glucose levels result in decreased insulin release from the beta cells and in the breakdown of glycogen to glucose. This process is mainly controlled by the hormone glucagon, which acts in the opposite manner to insulin.[79]

If the amount of insulin available is insufficient, or if cells respond poorly to the effects of insulin (insulin resistance), or if the insulin itself is defective, then glucose is not absorbed properly by the body cells that require it, and is not stored appropriately in the liver and muscles. The net effect is persistently high levels of blood glucose, poor protein synthesis, and other metabolic derangements, such as metabolic acidosis in cases of complete insulin deficiency.[78]

When there is too much glucose in the blood for a long time, the kidneys cannot absorb it all (reach a threshold of reabsorption) and the extra glucose gets passed out of the body through urine (glycosuria).[80] This increases the osmotic pressure of the urine and inhibits reabsorption of water by the kidney, resulting in increased urine production (polyuria) and increased fluid loss. Lost blood volume is replaced osmotically from water in body cells and other body compartments, causing dehydration and increased thirst (polydipsia).[78] In addition, intracellular glucose deficiency stimulates appetite leading to excessive food intake (polyphagia).[81]

Diagnosis

[edit]

Diabetes mellitus is diagnosed with a test for the glucose content in the blood, and is diagnosed by demonstrating any one of the following:[72]

  • Fasting plasma glucose level ≥ 7.0 mmol/L (126 mg/dL). For this test, blood is taken after a period of fasting, i.e. in the morning before breakfast, after the patient had sufficient time to fast overnight or at least 8 hours before the test.
  • Plasma glucose ≥ 11.1 mmol/L (200 mg/dL) two hours after a 75 gram oral glucose load as in a glucose tolerance test (OGTT)
  • Symptoms of high blood sugar and plasma glucose ≥ 11.1 mmol/L (200 mg/dL) either while fasting or not fasting
  • Glycated hemoglobin (HbA1C) ≥ 48 mmol/mol (≥ 6.5 DCCT %).[82]
WHO diabetes diagnostic criteria[83][84]  edit
Condition 2-hour glucose Fasting glucose HbA1c
Unit mmol/L mg/dL mmol/L mg/dL mmol/mol DCCT %
Normal < 7.8 < 140 < 6.1 < 110 < 42 < 6.0
Impaired fasting glycaemia < 7.8 < 140 6.1–7.0 110–125 42–46 6.0–6.4
Impaired glucose tolerance ≥ 7.8 ≥ 140 < 7.0 < 126 42–46 6.0–6.4
Diabetes mellitus ≥ 11.1 ≥ 200 ≥ 7.0 ≥ 126 ≥ 48 ≥ 6.5

A positive result, in the absence of unequivocal high blood sugar, should be confirmed by a repeat of any of the above methods on a different day. It is preferable to measure a fasting glucose level because of the ease of measurement and the considerable time commitment of formal glucose tolerance testing, which takes two hours to complete and offers no prognostic advantage over the fasting test.[85] According to the current definition, two fasting glucose measurements at or above 7.0 mmol/L (126 mg/dL) is considered diagnostic for diabetes mellitus.

Per the WHO, people with fasting glucose levels from 6.1 to 6.9 mmol/L (110 to 125 mg/dL) are considered to have impaired fasting glucose.[86] People with plasma glucose at or above 7.8 mmol/L (140 mg/dL), but not over 11.1 mmol/L (200 mg/dL), two hours after a 75 gram oral glucose load are considered to have impaired glucose tolerance. Of these two prediabetic states, the latter in particular is a major risk factor for progression to full-blown diabetes mellitus, as well as cardiovascular disease.[87] The American Diabetes Association (ADA) since 2003 uses a slightly different range for impaired fasting glucose of 5.6 to 6.9 mmol/L (100 to 125 mg/dL).[88]

Glycated hemoglobin is better than fasting glucose for determining risks of cardiovascular disease and death from any cause.[89]

Prevention

[edit]

There is no known preventive measure for type 1 diabetes.[2] However, islet autoimmunity and multiple antibodies can be a strong predictor of the onset of type 1 diabetes.[90] Type 2 diabetes—which accounts for 85–90% of all cases worldwide—can often be prevented or delayed[91] by maintaining a normal body weight, engaging in physical activity, and eating a healthy diet.[2] Higher levels of physical activity (more than 90 minutes per day) reduce the risk of diabetes by 28%.[92] Dietary changes known to be effective in helping to prevent diabetes include maintaining a diet rich in whole grains and fiber, and choosing good fats, such as the polyunsaturated fats found in nuts, vegetable oils, and fish.[93] Limiting sugary beverages and eating less red meat and other sources of saturated fat can also help prevent diabetes.[93] Tobacco smoking is also associated with an increased risk of diabetes and its complications, so smoking cessation can be an important preventive measure as well.[94]

The relationship between type 2 diabetes and the main modifiable risk factors (excess weight, unhealthy diet, physical inactivity and tobacco use) is similar in all regions of the world. There is growing evidence that the underlying determinants of diabetes are a reflection of the major forces driving social, economic and cultural change: globalization, urbanization, population aging, and the general health policy environment.[95]

Comorbidity

[edit]

Diabetes patients' comorbidities have a significant impact on medical expenses and related costs. It has been demonstrated that patients with diabetes are more likely to experience respiratory, urinary tract, and skin infections, develop atherosclerosis, hypertension, and chronic kidney disease, putting them at increased risk of infection and complications that require medical attention.[96] Patients with diabetes mellitus are more likely to experience certain infections, such as COVID-19, with prevalence rates ranging from 5.3 to 35.5%.[97][98] Maintaining adequate glycemic control is the primary goal of diabetes management since it is critical to managing diabetes and preventing or postponing such complications.[99]

People with type 1 diabetes have higher rates of autoimmune disorders than the general population. An analysis of a type 1 diabetes registry found that 27% of the 25,000 participants had other autoimmune disorders.[100] Between 2% and 16% of people with type 1 diabetes also have celiac disease.[100]

Management

[edit]

Diabetes management concentrates on keeping blood sugar levels close to normal, without causing low blood sugar.[101] This can usually be accomplished with dietary changes,[102] exercise, weight loss, and use of appropriate medications (insulin, oral medications).[101]

Learning about the disease and actively participating in the treatment is important, since complications are far less common and less severe in people who have well-managed blood sugar levels.[101][103] The goal of treatment is an A1C level below 7%.[104][105] Attention is also paid to other health problems that may accelerate the negative effects of diabetes. These include smoking, high blood pressure, metabolic syndrome obesity, and lack of regular exercise.[101][106] Specialized footwear is widely used to reduce the risk of diabetic foot ulcers by relieving the pressure on the foot.[107][108][109] Foot examination for patients living with diabetes should be done annually which includes sensation testing, foot biomechanics, vascular integrity and foot structure.[110]

Concerning those with severe mental illness, the efficacy of type 2 diabetes self-management interventions is still poorly explored, with insufficient scientific evidence to show whether these interventions have similar results to those observed in the general population.[111]

Lifestyle

[edit]

People with diabetes can benefit from education about the disease and treatment, dietary changes, and exercise, with the goal of keeping both short-term and long-term blood glucose levels within acceptable bounds. In addition, given the associated higher risks of cardiovascular disease, lifestyle modifications are recommended to control blood pressure.[112][113]

Weight loss can prevent progression from prediabetes to diabetes type 2, decrease the risk of cardiovascular disease, or result in a partial remission in people with diabetes.[114][115] No single dietary pattern is best for all people with diabetes.[116] Healthy dietary patterns, such as the Mediterranean diet, low-carbohydrate diet, or DASH diet, are often recommended, although evidence does not support one over the others.[114][115] According to the ADA, "reducing overall carbohydrate intake for individuals with diabetes has demonstrated the most evidence for improving glycemia", and for individuals with type 2 diabetes who cannot meet the glycemic targets or where reducing anti-glycemic medications is a priority, low or very-low carbohydrate diets are a viable approach.[115] For overweight people with type 2 diabetes, any diet that achieves weight loss is effective.[116][117]

A 2020 Cochrane systematic review compared several non-nutritive sweeteners to sugar, placebo and a nutritive low-calorie sweetener (tagatose), but the results were unclear for effects on HbA1c, body weight and adverse events.[118] The studies included were mainly of very low-certainty and did not report on health-related quality of life, diabetes complications, all-cause mortality or socioeconomic effects.[118]

Exercise has demonstrated to impact people’s lives for a better health outcome. However, fear of hypoglycemia can negatively impact exercise view on youth that have been diagnosed with diabetes. Managing insulin, carbohydrate intake, and physical activity becomes a task that drive youth away benefitting from enjoying exercises. With different studies, an understanding of what can be done and applied to the youth population diagnosed with Type 1 Diabetes has been conducted. A study’s aim was to focus on the impact of an exercise education on physical activity. During the length of a 12-month program, youth and their parents participated in 4 education sessions learning about the benefits, safe procedures, glucose control, and physical activity. With a survey conducted in the beginning, youth and parents demonstrated their fear of hypoglycemia. At the end of the program, most of the youth and parents showed confidence on how to manage and handle situations regarding hypoglycemia. In some instances, youth provided feedback that a continuation of the sessions would be beneficial. In two other studies, exercise was the aim to investigate on how it affects adolescents with T1D. In one of those studies, the impact was assessed in the changes of glucose in exercise by how many minutes per day, intensity, duration, and heart rate. Also, glucose was monitored to see changes during exercise, post exercise, and overnight. The other study investigated how types of exercises can affect glucose levels. The exercise types were continuous moderate exercise and interval-high-intensity exercise. Both types consisted of 2 sets of 10-minute work at different pedaling paces. The continuous pedaled at a 50% and had a 5-minute passive recovery. The high-intensity pedaled at 150% for 15 seconds and was intermixed with a 30-second passive recovery.[119] So, when studies finished collecting data and were able to analyze it, the following were the results. For the studies comparing the different intensities, it was seen that insulin and carbohydrate intake did not have a significant difference before or after exercise. In regards of glucose content, there was a greater drop of blood glucose post exercise in the high intensity (-1.47mmol/L). During recovery, the continuous exercise showed a greater decrease in blood glucose. With all these, continuous exercise resulted in being more favorable for managing blood glucose levels. In the other study, it is mentioned that exercise also contributed to a notable impact on glucose levels. Post-exercise measurements, there was a low mean glucose level that occurred 12 to 16 hours after exercising. Although, with participants exercising for longer sessions (≥90 minutes), hypoglycemia rates were higher. With all these, participants showed well-managed glucose control by intaking proper carbohydrates amount without any insulin adjustments.[120] Lastly, the study, that educated youth and parents about exercise important and management of hypoglycemia, showed many youths feeling confident to continue to exercise regularly and being able to manage their glucose levels.[121] Therefore, as important as exercising is, showing youth and parents that being physical active is possible. That can be done in specific intensities and with proper understanding on how to handle glucose control over time.

Diabetes and youth

[edit]

Youth dealing with diabetes face unique challenges. These can include the emotional, psychological, and social implications as a result of managing a chronic condition at such a young age. Both forms of diabetes can have long-term risks for complications like cardiovascular disease, kidney damage, and nerve damage. This is why early intervention and impactful management important to improving long-term health. Physical activity plays a vital role in managing diabetes, improving glycemic control, and enhancing the overall quality of life for children and adolescents.

Younger children and adolescents with T1D tend to be more physically active compared to older individuals. This possibly because of the more demanding schedules and sedentary lifestyles of older adolescents, who are often in high school or university. This age-related decrease in physical activity is a potential challenge to keeping up with the ideal healthy lifestyle. [122] People who have had T1D for a longer amount of time also have a tendency to be less active. As diabetes progresses, people may face more barriers to engaging in physical activity. Examples of this could include anxiety about experiencing hypoglycemic events during exercise or the physical challenges posed by the long-term complications that diabetes cause. Increased physical activity in youth with T1D can be associated with improved health. These outcomes can include better lipid profiles (higher HDL-C and lower triglycerides), healthier body composition (reduced waist circumference and BMI), and improved overall physical health. These benefits are especially important during childhood and adolescence because this is when proper growth and development are occurring.

Younger people with type 2 diabetes have a tendency to have lower levels of physical activity and CRF compared to their peers without diabetes. This contributes to their poorer overall health and increases the risk of cardiovascular and metabolic complications.[123] Despite recommendations for physical activity as part of diabetes management, many youth and young adolesents with type 2 diabetes do not meet the guidelines, hindering their ability to effectively manage blood glucose levels and improve their health. CRF is a key health indicator. Higher levels of CRF is associated with better health outcomes. This means that increasing CRF through exercise can provide important benefits for managing type 2 diabetes. There is a need for targeted interventions that promote physical activity and improve CRF in youth with type 2 diabetes to help reduce the risk of long-term complications.

When it comes to resistance training, it is found to have no significant effect on insulin sensitivity in children and adolescents, despite it having positive trends. [124] Intervention length, training intensity, and the participants' physical maturation might explain the mixed results. Longer and higher-intensity programs showed more promising results. Future research could focus on more dire metabolic conditions like type II diabetes, investigate the role of physical maturation, and think about including longer intervention periods. While resistance training complements aerobic exercise, its standalone effects on insulin sensitivity remain unclear.

Medications

[edit]

Glucose control

[edit]

Most medications used to treat diabetes act by lowering blood sugar levels through different mechanisms. There is broad consensus that when people with diabetes maintain tight glucose control – keeping the glucose levels in their blood within normal ranges – they experience fewer complications, such as kidney problems or eye problems.[125][126] There is, however, debate as to whether this is appropriate and cost effective for people later in life in whom the risk of hypoglycemia may be more significant.[127]

There are a number of different classes of anti-diabetic medications. Type 1 diabetes requires treatment with insulin, ideally using a "basal bolus" regimen that most closely matches normal insulin release: long-acting insulin for the basal rate and short-acting insulin with meals.[128] Type 2 diabetes is generally treated with medication that is taken by mouth (e.g. metformin) although some eventually require injectable treatment with insulin or GLP-1 agonists.[129]

Metformin is generally recommended as a first-line treatment for type 2 diabetes, as there is good evidence that it decreases mortality.[7] It works by decreasing the liver's production of glucose, and increasing the amount of glucose stored in peripheral tissue.[130] Several other groups of drugs, mainly oral medication, may also decrease blood sugar in type 2 diabetes. These include agents that increase insulin release (sulfonylureas), agents that decrease absorption of sugar from the intestines (acarbose), agents that inhibit the enzyme dipeptidyl peptidase-4 (DPP-4) that inactivates incretins such as GLP-1 and GIP (sitagliptin), agents that make the body more sensitive to insulin (thiazolidinedione) and agents that increase the excretion of glucose in the urine (SGLT2 inhibitors).[130] When insulin is used in type 2 diabetes, a long-acting formulation is usually added initially, while continuing oral medications.[7]

Some severe cases of type 2 diabetes may also be treated with insulin, which is increased gradually until glucose targets are reached.[7][131]

Blood pressure lowering

[edit]

Cardiovascular disease is a serious complication associated with diabetes, and many international guidelines recommend blood pressure treatment targets that are lower than 140/90 mmHg for people with diabetes.[132] However, there is only limited evidence regarding what the lower targets should be. A 2016 systematic review found potential harm to treating to targets lower than 140 mmHg,[133] and a subsequent systematic review in 2019 found no evidence of additional benefit from blood pressure lowering to between 130 – 140mmHg, although there was an increased risk of adverse events.[134]

2015 American Diabetes Association recommendations are that people with diabetes and albuminuria should receive an inhibitor of the renin-angiotensin system to reduce the risks of progression to end-stage renal disease, cardiovascular events, and death.[135] There is some evidence that angiotensin converting enzyme inhibitors (ACEIs) are superior to other inhibitors of the renin-angiotensin system such as angiotensin receptor blockers (ARBs),[136] or aliskiren in preventing cardiovascular disease.[137] Although a more recent review found similar effects of ACEIs and ARBs on major cardiovascular and renal outcomes.[138] There is no evidence that combining ACEIs and ARBs provides additional benefits.[138]

Aspirin

[edit]

The use of aspirin to prevent cardiovascular disease in diabetes is controversial.[135] Aspirin is recommended by some in people at high risk of cardiovascular disease; however, routine use of aspirin has not been found to improve outcomes in uncomplicated diabetes.[139] 2015 American Diabetes Association recommendations for aspirin use (based on expert consensus or clinical experience) are that low-dose aspirin use is reasonable in adults with diabetes who are at intermediate risk of cardiovascular disease (10-year cardiovascular disease risk, 5–10%).[135] National guidelines for England and Wales by the National Institute for Health and Care Excellence (NICE) recommend against the use of aspirin in people with type 1 or type 2 diabetes who do not have confirmed cardiovascular disease.[128][129]

Surgery

[edit]

Weight loss surgery in those with obesity and type 2 diabetes is often an effective measure.[140] Many are able to maintain normal blood sugar levels with little or no medications following surgery[141] and long-term mortality is decreased.[142] There is, however, a short-term mortality risk of less than 1% from the surgery.[143] The body mass index cutoffs for when surgery is appropriate are not yet clear.[142] It is recommended that this option be considered in those who are unable to get both their weight and blood sugar under control.[144]

A pancreas transplant is occasionally considered for people with type 1 diabetes who have severe complications of their disease, including end stage kidney disease requiring kidney transplantation.[145]

Diabetic peripheral neuropathy (DPN) affects 30% of all diabetes patients.[146] When DPN is superimposed with nerve compression, DPN may be treatable with multiple nerve decompressions.[147][148] The theory is that DPN predisposes peripheral nerves to compression at anatomical sites of narrowing, and that the majority of DPN symptoms are actually attributable to nerve compression, a treatable condition, rather than DPN itself.[149][150] The surgery is associated with lower pain scores, higher two-point discrimination (a measure of sensory improvement), lower rate of ulcerations, fewer falls (in the case of lower extremity decompression), and fewer amputations.[150][151][152][148]

Self-management and support

[edit]

In countries using a general practitioner system, such as the United Kingdom, care may take place mainly outside hospitals, with hospital-based specialist care used only in case of complications, difficult blood sugar control, or research projects. In other circumstances, general practitioners and specialists share care in a team approach. Evidence has shown that social prescribing led to slight improvements in blood sugar control for people with type 2 diabetes.[153] Home telehealth support can be an effective management technique.[154]

The use of technology to deliver educational programs for adults with type 2 diabetes includes computer-based self-management interventions to collect for tailored responses to facilitate self-management.[155] There is no adequate evidence to support effects on cholesterol, blood pressure, behavioral change (such as physical activity levels and dietary), depression, weight and health-related quality of life, nor in other biological, cognitive or emotional outcomes.[155][156]

Epidemiology

[edit]
Rates of diabetes worldwide in 2014. The worldwide prevalence was 9.2%.
Mortality rate of diabetes worldwide in 2012 per million inhabitants
  28–91
  92–114
  115–141
  142–163
  164–184
  185–209
  210–247
  248–309
  310–404
  405–1879

In 2017, 425 million people had diabetes worldwide,[157] up from an estimated 382 million people in 2013[158] and from 108 million in 1980.[159] Accounting for the shifting age structure of the global population, the prevalence of diabetes is 8.8% among adults, nearly double the rate of 4.7% in 1980.[157][159] Type 2 makes up about 90% of the cases.[17][35] Some data indicate rates are roughly equal in women and men,[17] but male excess in diabetes has been found in many populations with higher type 2 incidence, possibly due to sex-related differences in insulin sensitivity, consequences of obesity and regional body fat deposition, and other contributing factors such as high blood pressure, tobacco smoking, and alcohol intake.[160][161]

The WHO estimates that diabetes resulted in 1.5 million deaths in 2012, making it the 8th leading cause of death.[162][159] However, another 2.2 million deaths worldwide were attributable to high blood glucose and the increased risks of cardiovascular disease and other associated complications (e.g. kidney failure), which often lead to premature death and are often listed as the underlying cause on death certificates rather than diabetes.[159][163] For example, in 2017, the International Diabetes Federation (IDF) estimated that diabetes resulted in 4.0 million deaths worldwide,[157] using modeling to estimate the total number of deaths that could be directly or indirectly attributed to diabetes.[157]

Diabetes occurs throughout the world but is more common (especially type 2) in more developed countries. The greatest increase in rates has, however, been seen in low- and middle-income countries,[159] where more than 80% of diabetic deaths occur.[164] The fastest prevalence increase is expected to occur in Asia and Africa, where most people with diabetes will probably live in 2030.[165] The increase in rates in developing countries follows the trend of urbanization and lifestyle changes, including increasingly sedentary lifestyles, less physically demanding work and the global nutrition transition, marked by increased intake of foods that are high energy-dense but nutrient-poor (often high in sugar and saturated fats, sometimes referred to as the "Western-style" diet).[159][165] The global number of diabetes cases might increase by 48% between 2017 and 2045.[157]

As of 2020, 38% of all US adults had prediabetes.[166] Prediabetes is an early stage of diabetes.

History

[edit]

Diabetes was one of the first diseases described,[167] with an Egyptian manuscript from c. 1500 BCE mentioning "too great emptying of the urine."[168] The Ebers papyrus includes a recommendation for a drink to take in such cases.[169] The first described cases are believed to have been type 1 diabetes.[168] Indian physicians around the same time identified the disease and classified it as madhumeha or "honey urine", noting the urine would attract ants.[168][169]

The term "diabetes" or "to pass through" was first used in 230 BCE by the Greek Apollonius of Memphis.[168] The disease was considered rare during the time of the Roman empire, with Galen commenting he had only seen two cases during his career.[168] This is possibly due to the diet and lifestyle of the ancients, or because the clinical symptoms were observed during the advanced stage of the disease. Galen named the disease "diarrhea of the urine" (diarrhea urinosa).[170]

The earliest surviving work with a detailed reference to diabetes is that of Aretaeus of Cappadocia (2nd or early 3rd century CE). He described the symptoms and the course of the disease, which he attributed to the moisture and coldness, reflecting the beliefs of the "Pneumatic School". He hypothesized a correlation between diabetes and other diseases, and he discussed differential diagnosis from the snakebite, which also provokes excessive thirst. His work remained unknown in the West until 1552, when the first Latin edition was published in Venice.[170]

Two types of diabetes were identified as separate conditions for the first time by the Indian physicians Sushruta and Charaka in 400–500 CE with one type being associated with youth and another type with being overweight.[168] Effective treatment was not developed until the early part of the 20th century when Canadians Frederick Banting and Charles Best isolated and purified insulin in 1921 and 1922.[168] This was followed by the development of the long-acting insulin NPH in the 1940s.[168]

Etymology

[edit]

The word diabetes (/ˌd.əˈbtz/ or /ˌd.əˈbtɪs/) comes from Latin diabētēs, which in turn comes from Ancient Greek διαβήτης (diabētēs), which literally means "a passer through; a siphon".[171] Ancient Greek physician Aretaeus of Cappadocia (fl. 1st century CE) used that word, with the intended meaning "excessive discharge of urine", as the name for the disease.[172][173] Ultimately, the word comes from Greek διαβαίνειν (diabainein), meaning "to pass through",[171] which is composed of δια- (dia-), meaning "through" and βαίνειν (bainein), meaning "to go".[172] The word "diabetes" is first recorded in English, in the form diabete, in a medical text written around 1425.

The word mellitus (/məˈltəs/ or /ˈmɛlɪtəs/) comes from the classical Latin word mellītus, meaning "mellite"[174] (i.e. sweetened with honey;[174] honey-sweet[175]). The Latin word comes from mell-, which comes from mel, meaning "honey";[174][175] sweetness;[175] pleasant thing,[175] and the suffix -ītus,[174] whose meaning is the same as that of the English suffix "-ite".[176] It was Thomas Willis who in 1675 added "mellitus" to the word "diabetes" as a designation for the disease, when he noticed the urine of a person with diabetes had a sweet taste (glycosuria). This sweet taste had been noticed in urine by the ancient Greeks, Chinese, Egyptians, and Indians.[177]

Society and culture

[edit]

The 1989 "St. Vincent Declaration"[178][179] was the result of international efforts to improve the care accorded to those with diabetes. Doing so is important not only in terms of quality of life and life expectancy but also economically – expenses due to diabetes have been shown to be a major drain on health – and productivity-related resources for healthcare systems and governments.

Several countries established more and less successful national diabetes programmes to improve treatment of the disease.[180]

Diabetes stigma

[edit]

Diabetes stigma describes the negative attitudes, judgment, discrimination, or prejudice against people with diabetes. Often, the stigma stems from the idea that diabetes (particularly Type 2 diabetes) resulted from poor lifestyle and unhealthy food choices rather than other causal factors like genetics and social determinants of health.[181] Manifestation of stigma can be seen throughout different cultures and contexts. Scenarios include diabetes statuses affecting marriage proposals, workplace-employment, and social standing in communities.[182]

Stigma is also seen internally, as people with diabetes can also have negative beliefs about themselves. Often these cases of self-stigma are associated with higher diabetes-specific distress, lower self-efficacy, and poorer provider-patient interactions during diabetes care.[183]

Racial and economic inequalities

[edit]

Racial and ethnic minorities are disproportionately affected with higher prevalence of diabetes compared to non-minority individuals.[184] While US adults overall have a 40% chance of developing type 2 diabetes, Hispanic/Latino adults chance is more than 50%.[185] African Americans also are much more likely to be diagnosed with diabetes compared to White Americans. Asians have increased risk of diabetes as diabetes can develop at lower BMI due to differences in visceral fat compared to other races. For Asians, diabetes can develop at a younger age and lower body fat compared to other groups. Additionally, diabetes is highly underreported in Asian American people, as 1 in 3 cases are undiagnosed compared to the average 1 in 5 for the nation.[186]

People with diabetes who have neuropathic symptoms such as numbness or tingling in feet or hands are twice as likely to be unemployed as those without the symptoms.[187]

In 2010, diabetes-related emergency room (ER) visit rates in the United States were higher among people from the lowest income communities (526 per 10,000 population) than from the highest income communities (236 per 10,000 population). Approximately 9.4% of diabetes-related ER visits were for the uninsured.[188]

Naming

[edit]

The term "type 1 diabetes" has replaced several former terms, including childhood-onset diabetes, juvenile diabetes, and insulin-dependent diabetes mellitus. Likewise, the term "type 2 diabetes" has replaced several former terms, including adult-onset diabetes, obesity-related diabetes, and noninsulin-dependent diabetes mellitus. Beyond these two types, there is no agreed-upon standard nomenclature.[189]

Diabetes mellitus is also occasionally known as "sugar diabetes" to differentiate it from diabetes insipidus.[190]

Other animals

[edit]

Diabetes can occur in mammals or reptiles.[191][192] Birds do not develop diabetes because of their unusually high tolerance for elevated blood glucose levels.[193]

In animals, diabetes is most commonly encountered in dogs and cats. Middle-aged animals are most commonly affected. Female dogs are twice as likely to be affected as males, while according to some sources, male cats are more prone than females. In both species, all breeds may be affected, but some small dog breeds are particularly likely to develop diabetes, such as Miniature Poodles.[194]

Feline diabetes is strikingly similar to human type 2 diabetes. The Burmese, Russian Blue, Abyssinian, and Norwegian Forest cat breeds are at higher risk than other breeds. Overweight cats are also at higher risk.[195]

The symptoms may relate to fluid loss and polyuria, but the course may also be insidious. Diabetic animals are more prone to infections. The long-term complications recognized in humans are much rarer in animals. The principles of treatment (weight loss, oral antidiabetics, subcutaneous insulin) and management of emergencies (e.g. ketoacidosis) are similar to those in humans.[194]

See also

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