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Red meat in traditional culinary terminology is meat which is red when raw and not white when cooked. Red meat also includes the meat of most adult mammals.
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%.
According to the USDA all meats obtained from livestock (i.e., from mammals) are red meats because they contain more myoglobin than chicken or fish.
Red meat contains small amounts of vitamin D. The liver contains much higher quantities than other parts of the animal.
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.
Epidemiological studies have found that an increased consumption of processed and red meat is associated with an increased risk of colorectal cancer. The risk is not associated with 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 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 red meat at high temperature and smoking produces the carcinogens polycyclic aromatic hydrocarbon compounds (PAHs) and heterocyclic amines (HCA)  Red meat itself contains certain factors that, under certain conditions, produce carcinogens like N-nitroso compounds (NOCs)  Additionally, the heme iron that gives meat its red color may promote carcinogenesis due to its ability to increase cell proliferation in the mucosa, through lipid peroxidation and/or cytotoxicity of fecal water  Both 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 postwar Seven Countries Study found a significant correlation between red meat consumption and risk of CHD and marked the beginning of our current understanding.
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."
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.
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."
A survey of twins found that processed meat intake was associated with weight gain. Western diets, which include higher consumption of red meats, are often associated with obesity.
^Food, Nutrition, Physical Activity, and the Prevention of Cancer: a Global Perspective. p. 116. ISBN978-0-9722522-2-5.
^Song P, Lu M, Yin Q, et al. (June 2014). "Red meat consumption and stomach cancer risk: a meta-analysis". J. Cancer Res. Clin. Oncol. (Meta-analysis) 140 (6): 979–92. doi:10.1007/s00432-014-1637-z. PMID24682372.
^Ferrís J, Berbel O, Alonso-López J, Garcia J, Ortega JA (October 2013). "Environmental non-occupational risk factors associated with bladder cancer". Actas Urol Esp (Review) 37 (9): 579–86. doi:10.1016/j.acuro.2013.02.004. PMID23618510.
^Alexander DD, Morimoto LM, Mink PJ, Cushing CA (December 2010). "A review and meta-analysis of red and processed meat consumption and breast cancer". Nutr Res Rev (Review & meta-analysis) 23 (2): 349–65. doi:10.1017/S0954422410000235. PMID21110906.
^Menotti A, Kromhout D, Blackburn H, Fidanza F, Buzina R, Nissinen A, for the Seven Countries Study Research Group (1999). Food intake patterns and 25-year mortality from coronary heart disease: Cross-cultural correlations in the Seven Countries Study. Eur J Epidemiol 15, 507–515.
^Fung, T. T. et al. “Prospective study of major dietary patterns and stroke risk in women.” Stroke 35.9 (2004): 2014.
^Oh, Sun Min et al. “Association between meat consumption and carotid intima-media thickness in Korean adults with metabolic syndrome.” Journal of Preventive Medicine and Public Health = Yebang Ŭihakhoe Chi 43.6 (2010): 486–495
^Kontogianni, M. D. et al. “Relationship between meat intake and the development of acute coronary syndromes: the CARDIO2000 case–control study.” European journal of clinical nutrition 62.2 (2007): 171–177.
^Zyriax BC, Boeing H, Windler E (2005). Nutrition is sometimes thought to be a powerful independent risk factor for coronary heart disease in women-The CORA study: a population-based case–control study. Eur J Clin Nutr 59, 1201–1207.
^Gotto AM, LaRosa JC, Hunninghake D, Grundy SM, Wilson PW, Clarkson TB et al. (1990). The cholesterol facts. A summary relating dietary fats, serum cholesterol and coronary heart disease. Circulation 81, 1721–1733.
^Leaf A, Weber PC (1988). Cardiovascular effects of n-3 fatty acids. N Engl J Med 318, 549–557.
^Malaviarachchi D, Veugelers PJ, Yip AM, MacLean DR (2002). Dietary iron as a risk factor for myocardial infarction. Public health considerations for Nova Scotia. Can J Public Health 93, 267–270.
^Verhoef P, Stampfer MJ, Buring JE, Gaziano JM, Allen RH, Stabler SP et al. (1996). Homocysteine metabolism and risk of myocardial infarction: relation with vitamins B6 and B12 and folate. Am J Epidemiol 143, 845–859.
^Kontogianni, M. D.; Panagiotakos, D. B.; Pitsavos, C.; Chrysohoou, C.; Stefanadis, C. (2007). "Relationship between meat intake and the development of acute coronary syndromes: The CARDIO2000 case–control study". European Journal of Clinical Nutrition62 (2): 171–177. doi:10.1038/sj.ejcn.1602713. PMID17356558.edit
^Kahn, H. A.; Phillips, R. L.; Snowdon, D. A.; Choi, W. (1984). "Association between reported diet and all-cause mortality. Twenty-one-year follow-up on 27,530 adult Seventh-Day Adventists". American Journal of Epidemiology119 (5): 775–787. PMID6720674. edit
^Song, Y. et al. “A prospective study of red meat consumption and type 2 diabetes in middle-aged and elderly women.” Diabetes Care 27.9 (2004): 2108.
^Fung, T. T. et al. “Dietary patterns, meat intake, and the risk of type 2 diabetes in women.” Archives of internal medicine 164.20 (2004): 2235.
^ abVan Dam, R. M.; Willett, W. C.; Rimm, E. B.; Stampfer, M. J.; Hu, F. B. (2002). "Dietary Fat and Meat Intake in Relation to Risk of Type 2 Diabetes in Men". Diabetes Care25 (3): 417–424. doi:10.2337/diacare.25.3.417. PMID11874924.edit
^de Mello, V. D. F. et al. “Withdrawal of red meat from the usual diet reduces albuminuria and improves serum fatty acid profile in type 2 diabetes patients with macroalbuminuria.” American Journal of Clinical Nutrition 83.5 (2006): 1032.
^Gross, J. L.; Zelmanovitz, T.; Moulin, C. C.; De Mello, V.; Perassolo, M.; Leitão, C.; Hoefel, A.; Paggi, A.; Azevedo, M. J. (2002). "Effect of a Chicken-Based Diet on Renal Function and Lipid Profile in Patients With Type 2 Diabetes: A randomized crossover trial". Diabetes Care25 (4): 645–651. doi:10.2337/diacare.25.4.645. PMID11919119.edit
^Hu, F. B.; Van Dam, S.; Liu, R. M. (2001). "Diet and risk of Type II diabetes: the role of types of fat and carbohydrate". Diabetologia44 (7): 805–817. doi:10.1007/s001250100547. PMID11508264. edit
^Feskens, E. J. M.; Kromhout, D. (1990). "Habitual Dietary Intake and Glucose Tolerance in Euglycaemic Men: The Zutphen Study". International Journal of Epidemiology19 (4): 953–959. doi:10.1093/ije/19.4.953. PMID2084027.edit
^Schulze, M. B.; Manson, J. E.; Willett, W. C.; Hu, F. B. (2003). "Processed meat intake and incidence of Type 2 diabetes in younger and middle-aged women". Diabetologia46 (11): 1465–1473. doi:10.1007/s00125-003-1220-7. PMID14576980.edit
^Halkjær, J.; Olsen, A.; Overvad, K.; Jakobsen, M. U.; Boeing, H.; Buijsse, B.; Palli, D.; Tognon, G.; Du, H.; Van Der a, D. L.; Forouhi, N. G.; Wareham, N. J.; Feskens, E. J. M.; Sørensen, T. I. A.; Tjønneland, A. (2010). "Intake of total, animal and plant protein and subsequent changes in weight or waist circumference in European men and women: The Diogenes project". International Journal of Obesity35 (8): 1104–1113. doi:10.1038/ijo.2010.254. PMID21139559.edit
^Appleby, P.; Thorogood, M.; Mann, J.; Key, T. (1998). "Low body mass index in non-meat eaters: the possible roles of animal fat, dietary fibre and alcohol". International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity22 (5): 454–460. doi:10.1038/sj.ijo.0800607. PMID9622343. edit
^Schulze, M. B. et al. “Dietary Patterns and Changes in Body Weight in Women.” Obesity 14.8 (2006): 1444–1453.
^Seifert, R.; Höer, A.; Schwaner, I.; Buschauer, A. (1992). "Histamine increases cytosolic Ca2+ in HL-60 promyelocytes predominantly via H2 receptors with an unique agonist/antagonist profile and induces functional differentiation". Molecular Pharmacology42 (2): 235–241. PMID1381044. edit
^Bes-Rastrollo, M.; Sánchez-Villegas, A.; Gómez-Gracia, E.; Martínez, J. A.; Pajares, R. M.; Martínez-González, M. A. (2006). "Predictors of weight gain in a Mediterranean cohort: The Seguimiento Universidad de Navarra Study 1". The American journal of clinical nutrition83 (2): 362–370; quiz 370–5. PMID16469996. edit
^Hasselbalch, A. L.; Heitmann, B. L.; Kyvik, K. O.; Sørensen, T. I. A. (2010). "Associations between dietary intake and body fat independent of genetic and familial environmental background". International Journal of Obesity34 (5): 892–898. doi:10.1038/ijo.2010.1. PMID20125102.edit
^Song, Y.; Park, M. J.; Paik, H. -Y.; Joung, H. (2009). "Secular trends in dietary patterns and obesity-related risk factors in Korean adolescents aged 10–19 years". International Journal of Obesity34 (1): 48–56. doi:10.1038/ijo.2009.203. PMID19823182.edit
^Paradis, A. -M.; Godin, G.; Pérusse, L.; Vohl, M. -C. (2009). "Associations between dietary patterns and obesity phenotypes". International Journal of Obesity33 (12): 1419–1426. doi:10.1038/ijo.2009.179. PMID19736556.edit
^Pattison, D. J. et al. “Dietary risk factors for the development of inflammatory polyarthritis: evidence for a role of high level of red meat consumption.” Arthritis & Rheumatism 50.12 (2004): 3804–3812.