Commonly, especially in gastronomy, red meat or dark meat is red when raw and dark in color when cooked, in contrast to white meat, which is pale in color before and after cooking. This definition only refers to flesh from mammals or fowl.
In nutritional science, red meat is defined as any meat that has more myoglobin than white meat, white meat being defined as non-dark meat from chicken (excluding leg or thigh), or fish. Some meat, such as pork, is red meat using the nutritional definition, and white meat using the common definition.
|Chicken Breast||0.005%||White Meat |
|Chicken Thigh||0.18 - 0.20%||Dark Meat|
|Turkey Thigh||0.25 - 0.30%||Dark Meat|
|Pork||0.10 - 0.30%||Red Meat|
|Veal||0.10 - 0.30%||Red Meat|
|Beef||0.40 - 1.00%||Red Meat|
|Old beef||1.50 - 2.00%||Red Meat|
The culinary definition has many rules and exceptions. Generally meat from mammals (for example cattle, horse meat, bull meat) and meat from hunting (wild boars, deer, pigeons, partridges, quail and pheasant) excluding fish and insects are considered red meat. Although poultry is usually considered white, duck and goose are red. For some animals the culinary definition of red meat differs by cut, and sometimes by the age of the animal is when it was slaughtered. Pork is considered red if the animal is adult, but white if young (e.g. suckling pig). The same applies to young lamb and veal. Game is sometimes put in a separate category altogether. (French: viandes noires — "dark meats".)
Pork is considered white under the culinary definition, but red in nutritional studies. The National Pork Board has positioned it as "Pork. The Other White Meat", profiting from the ambiguity to suggest that pork has the nutritional properties of white meat, which is considered more healthful.
Red meat contains large amounts of iron, creatine, minerals such as zinc and phosphorus, and B-vitamins: (niacin, vitamin B12, thiamin and riboflavin). Red meat is the richest source of lipoic acid, a powerful antioxidant.
The 1992 edition of the USDA food guide pyramid has been criticized for not distinguishing between red meat and other types of meat. The 2005 edition, MyPyramid, was confusing but the accompanying website stated that "fish, nuts, and seeds contain healthy oils, so choose these foods frequently instead of meat or poultry" and for people who wanted to eat meat, it recommended lean or low-fat red meat and poultry.
Healthy Eating Plate
In 2011, the Harvard School of Public Health launched the Healthy Eating Plate to better communicate with the public and to make different recommendations than the USDA, which has to contend with lobbying from many quarters. The Healthy Eating Plate encourages consumers to limit red meat and avoid processed meat, and to instead choose fish, poultry, beans or nuts. Its website says: "Eating a lot of red meat and processed meat has been linked to increased risk of heart disease, diabetes, and colon cancer. So it’s best to avoid processed meat, and to limit red meat to no more than twice a week. Switching to fish, chicken, nuts, or beans in place of red meat and processed meat can improve cholesterol levels and can lower the risk of heart disease and diabetes.
Red meat is not a uniform product; its health effects can vary based on fat content, processing and preparation. Processed red meat is strongly linked to higher mortality, mainly due to cardiovascular diseases and cancer. There is some evidence too that the consumption of unprocessed red meat may have negative health effects in humans.
According to the International Agency for Research on Cancer, a part of the World Health Organization, red meat is probably carcinogenic to humans, with possible risks for colorectal cancer, pancreatic cancer, Gastric cancer, and prostate cancer. Red meat contains vitamin B12 helping our body to make more blood cells, proteins assisting our bones and muscles to be stronger, and zinc which helps our immune system to work properly. There is no good evidence that red meat consumption increases breast cancer or prostate cancer risk according to a 2010 study. Red meat itself contains certain factors that, under certain conditions, produce carcinogens like N-nitroso compounds (NOCs).
The consensus on the role of red meat consumption to increased risk of cardiovascular diseases has changed in recent years. Studies that differentiate between processed and fresh red meat have failed to find a link between unprocessed red meat consumption and heart disease. A major Harvard University meta-study in 2010 involving over one million people who ate meat found that only processed meat had an adverse risk in relation to coronary heart disease. The study suggests that the "differences in salt and preservatives, rather than fats, might explain the higher risk of heart disease and diabetes seen with processed meats, but not with unprocessed red meats."
Unprocessed red meat intake is tentatively associated with an increased risk of type II diabetes, but the link is weaker and less certain than the link between processed red meat and diabetes. Other findings have suggested that the association may be due to saturated fat, trans fat and dietary cholesterol, rather than red meat per se. One study estimated that “substitutions of one serving of nuts, low-fat dairy, and whole grains per day for one serving of red meat per day were associated with a 16–35% lower risk of type 2 diabetes”.
Eating processed meat (e.g., bacon, ham, hot dogs, sausages) is linked to some cancers according to the International Agency for Research on Cancer of the World Health Organization. Epidemiological studies have found that an increased consumption of processed meat is associated with an increased risk of colorectal cancer. While two studies indicate that the risk associated with processed meat is unrelated to white meat like chicken., IARC's Press Release 240, based on a review of 800 studies over 20 years does not distinguish in this manner, defining processed meat as follows: Processed meat refers to meat that has been transformed through salting, curing, fermentation, smoking, or other processes to enhance flavour or improve preservation. Most processed meats contain pork or beef, but processed meats may also contain other red meats, poultry, offal, or meat by-products such as blood.
Nitrates and nitrites found in processed meat (e.g. bacon, ham, salami, pepperoni, hot dogs, and some sausages) can be converted by our body into nitrosamines that can be carcinogenic, causing mutation in the colorectal cell line, thereby causing tumorigenesis and eventually leading to cancer.
Cooking any meat at high temperature and smoking produces the carcinogens polycyclic aromatic hydrocarbon compounds (PAHs) and heterocyclic amines (HCA). The subgroups of heterocyclic amines compounds are Amino-dimethylimidazo-Quinoxaline (MelQx), Amino-Dimethylimidazo-Quinoxaline (DiMelQx), and Amino-methyl-phenylimidazo-pyridine (PhIP), which are mostly formed during cooking meat at high temperatures.Benzo[a]pyrene (B[a]P) is another compound found in meat cooked in extremely high temperatures-this aromatic hydrocarbon is normally found in coal tar, wood burning, or automobile exhaust fumes. According to a study, there was 36% of the MeIQx and 50% of DiMeIQx was present in the well-done barbecued steak; contrary, 20% of PhIP was present in medium-done barbecued steak. Likely because of these factors, marinating fresh lean red meat and thoroughly cooking the meat at low temperature will reduce the production of carcinogenic compounds and thereby lower the risk of colorectal cancer.
The World Cancer Research Fund (WCRF) and American Institute for Cancer Research (AICR) classify red meat consumption as carrying an increased risk of contracting bowel cancer. In the United Kingdom approximately 21% of bowel cancers are associated with red meat consumption. The WCRF recommends limiting intake of red meat to less than 300g (11 oz) cooked weight per week, "very little, if any of which to be processed."
There is suggestive evidence that red meat intake might increase the risk of esophageal, pancreatic, stomach, endometrial, lung, and bladder cancer. A meta-analysis of eighteen cohort and control studies was done to provide an evaluation of the relationship between red meat and stomach/gastric cancer. The results suggested a linear increase in gastric cancer risk with increasing red meat intake.
Some mechanisms that have been suggested for why red meat consumption is a risk factor for cardiovascular disease include: its impact on serum cholesterol, that red meat contains arachidonic acid, heme iron, homocysteine, and its high saturated fat content. Bacteria in the digestive tract of people who eat meat have been found to produce a spike in TMAO when supplied with carnitine (abundant in red meat).
Other health issues
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