||This article needs more medical references for verification or relies too heavily on primary sources. (September 2014)|
- 1 Definitions
- 2 Nutrition
- 3 Human health
- 4 Culture
- 5 See also
- 6 References
- 7 External links
In gastronomy, red meat is darker-colored meat, as contrasted with white meat. The exact definition varies by time, place, and culture, but the meat from adult mammals such as cows, sheep, and horses is invariably considered red, while chicken and rabbit meat is invariably considered white. The meat of young mammals such as milk-fed veal calves, sheep, and pigs is traditionally considered white; while the meat of duck and goose is considered red. Game is sometimes put in a separate category altogether. (French: viandes noires — "black meats")
The old determinant of the nutritional definition of the color of meat is the concentration of myoglobin. The white meat of chicken has under 0.05%; pork and veal have 0.1–0.3%; young beef has 0.4–1.0%; and old beef has 1.5–2.0%.
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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, recommends lean forms of red meat.
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 be bad for human health.
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."
Research studies have implied that the risk of colorectal caner increases with an increase in the consumption of processed and red meat. The risk is not associated with the white meat like chicken. Processed meats like bacon, ham, salami, pepperoni, hot dogs, and some sausages are preserved by smoking, salting, and addition of certain chemicals like nitrates and nitrites. Nitrates and nitrites are frequently converted by our body into nitrosamines that are carcinogenic, causing mutation in the colorectal cell line, thereby causing tumorigenesis and eventually leading to cancer. Smoking and highly cooked meat (high temperature) produce polycyclic aromatic hydrocarbon compounds (PAHs), and heterocyclic amines (HCA) that are carcinogens. Red meat itself contains certain factors that produce carcinogenic N-nitroso compounds (NOC). High amount of heme iron in red meat is also associated with the damage of colorectal cells.
Several hypotheses, which are mainly based on studies carried out on red meat, may explain why processed meat intake is linked to cancer risk. Those that have been tested experimentally include (i) that high-fat diets could promote carcinogenesis via insulin resistance or fecal bile acids; (ii) that cooking meat at a high temperature forms carcinogenic heterocyclic amines and polycyclic aromatic hydrocarbons; (iii) that carcinogenic N-nitroso compounds are formed in meat and endogenously; (iv) that heme iron in red meat can promote carcinogenesis because it increases cell proliferation in the mucosa, through lipoperoxidation and/or cytotoxicity of fecal water.
Many studies associate red meat consumption with cardiovascular diseases. Specifically red meat consumption is associated with ischemic heart disease, stroke, with greater intima-media thickness, (an indicator of atherosclerosis), acute coronary syndrome, A significant relationship between red meat and CHD has been found specifically for women,
Processed Meat Vs Unprocessed
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."
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, and homocysteine., its high content of saturated fat. 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). TMAO is a metabolite that promotes atherosclerosis, a thickening of the arteries.
Those that eat more than 8 servings of red meat per month are 4.9 times more likely to have cardiac events than those eating less than four servings per month.
A 21-year follow up of about thirty thousand Seventh-day Adventists (adventists are known for presenting a "health message" that recommends vegetarianism) found that people who ate red meat daily were 60% more likely to die of heart disease than those who ate red meat less than once per week.
The risk of coronary disease due to high cholesterol can be mitigated by switching to a leaner red meat. According to one study, funded by the beef producers advocacy group, National Cattlemen's Beef Association, eating lean meat (both red and white) produced nearly identical cholesterol, and triglyceride levels in both groups.
Red meat intake has been associated with an increased risk of type II diabetes. Interventions in which red meat is removed from the diet can lower albuminuria levels. Replacing red meat with a low protein or chicken diet can improve glomerular filtration rate.
Other findings have suggested that the association may be due to saturated fat, trans fat and dietary cholesterol, rather than red meat per se. An additional confound is that diets high in processed meat could increase the risk for developing Type 2 diabetes.
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”.
The Diogenes project used data from ninety thousand men and women over about seven years and found that "higher intake of total protein, and protein from animal sources was associated with subsequent weight gain for both genders, strongest among women, and the association was mainly attributable to protein from red and processed meat and poultry rather than from fish and dairy sources. There was no overall association between intake of plant protein and subsequent changes in weight." They also found an association between red meat consumption and increased waist circumference.
A 1998 survey of about five thousand vegetarian and non-vegetarian people found that vegetarians had about 30% lower BMIs. A 2006 survey of fifty thousand women found that those with higher "western diet pattern" scores gained about two more kilograms over the course of four years than those who lowered their scores.
A ten-year follow up of 80,000 men and women found that "ten-year changes in body mass index was associated positively with meat consumption" as well as with weight gain at the waist. In a Mediterranean population of 8,000 men and women, meat consumption was significantly associated with weight gain. Data from the National Health and Nutrition Examination Survey showed "consistent positive associations between meat consumption and BMI, waist circumference, obesity and central obesity."
Other health issues
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