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Meat is animal that is eaten as food. ξ1 Humans are , ξ2 ξ3 and have hunted and killed animals for meat since prehistoric times. The advent of civilization allowed the domestication of animals such as chickens, sheep, pigs and cattle, and eventually their use in meat production on an industrial scale.

Meat is mainly composed of water and , and is usually eaten together with other food. It is edible raw, but is normally eaten after it has been cooked and seasoned or processed in a variety of ways. Unprocessed meat will within hours or days. Spoilage is caused by the practically unavoidable infection and subsequent decomposition of meat by bacteria and fungi, which are borne by the animal itself, by the people handling the meat, and by their implements.

Meat consumption varies worldwide, depending on cultural or religious preferences, as well as economic conditions. choose not to eat meat because of ethical, economic, environmental, religious or health concerns that are associated with meat production and consumption.

Most often, meat refers to and associated and other tissues, but it may also describe other edible tissues such as . Conversely, meat is sometimes used in a more restrictive sense – the flesh of species (pigs, cattle, lambs, etc.) raised and prepared for human consumption, to the exclusion of and other seafood, and other animals.

The word meat comes from the word mete, which referred to food in general. The term is related to mad in , mat in and , and matur in and , which also mean 'food'. The word mete also exists in (and to a lesser extent, modern ) to denote important food, differentiating it from swiets (sweets) and dierfied (animal feed).

evidence suggests that meat constituted a substantial proportion of the diet of even the earliest humans. Early depended on the organized hunting of large animals such as and .

The of animals, of which we have evidence dating back to the end of the (c. 10,000 BC), allowed the systematic production of meat and the of animals with a view to improving meat production. The animals which are now the principal sources of meat were domesticated in conjunction with the development of early civilizations:

  • , originating from western Asia, were domesticated with the help of dogs prior to the establishment of settled , likely as early as the 8th millennium BC. Several breeds of sheep were established in ancient and by 3500–3000 BC. Presently, more than 200 exist.
  • were domesticated in Mesopotamia after settled agriculture was established about 5000 BC, and several breeds were established by 2500 BC. Modern domesticated cattle fall into the groups (European cattle) and (zebu), both descended from the now-extinct . The breeding of , cattle optimized for meat production as opposed to animals best suited for draught or dairy purposes, began in the middle of the 18th century.
  • , which are descended from , are known to have existed about 2500 BC in modern-day Hungary and in ; earlier pottery from and Egypt depicts wild pigs. sausages and were of great commercial importance in times. Pigs continue to be bred intensively as they are being optimized to produce meat best suited for specific meat products.
Other animals are or have been raised or hunted for their flesh. The type of meat consumed varies much between different cultures, changes over time, depending on factors such as tradition and the availability of the animals. The amount and kind of meat consumed also varies by income, both between countries and within a given country.Mark Gehlhar and William Coyle, "Global Food Consumption and Impacts on Trade Patterns", Chapter 1 in Changing Structure of Global Food Consumption and Trade, edited by Anita Regmi, May 2001. USDA Economic Research Service.
  • are commonly eaten in countries such as FranceChrisafis, Angelique "France's horsemeat lovers fear US ban The Guardian, June 15th 2007, London. Italy, Germany and .Alan Davidson (2006). Tom Jaine, Jane Davidson and Helen Saberi. ed. The Oxford Companion to Food. Oxford: Oxford University Press. ISBN 0-19-280681-5, pp. 387-388 Horses and other large such as were hunted during the Late Paleolithic in western Europe.Turner, E. 2005. "Results of a recent analysis of horse remains dating to the Magdalenian period at Solutre, France," pp 70-89. In Mashkour, M (ed.). Equids in Time and Space. Oxford: Oxbow
  • are consumed in ,Rupert Wingfield-Hayes (29 June 2002). "China's taste for the exotic". BBC News. Retrieved 2007-05-15. and ."Vietnam's dog meat tradition". BBC News. 31 December 2001. Retrieved 2007-05-15."Vietnam's dog meat tradition". BBC News. 31 December 2001. Retrieved 2007-05-15. Dogs are also occasionally eaten in the regions.Francis H. Fay (June 1960) "Carnivorous walrus and some arctic zoonoses". Arctic 13, no.2: 111-122. Historically, dog meat has been consumed in various part of the world, such as ,Schwabe, Calvin W. (1979). Unmentionable cuisine. University of Virginia Press. p. 168. ISBN 978-0-8139-1162-5. Japan,Hanley, Susan B. (1999). Everyday things in premodern Japan: the hidden legacy of material culture. University of California Press. p. 66. ISBN 0-520-21812-4. Schwabe, Calvin W. (1979). Unmentionable cuisine. University of Virginia Press. p. 173. ISBN 978-0-8139-1162-5. and .Alan Davidson (2006). Tom Jaine, Jane Davidson and Helen Saberi. ed. The Oxford Companion to Food. Oxford: Oxford University Press. ISBN 0-19-280681-5, pp. 491
  • are consumed in Southern China and .
  • are raised for their flesh in the .
  • and are hunted, partly for their flesh, in Japan, , , Canada, the , , , and by two small communities in .

Modern agriculture employs a number of techniques, such as , to make animals rapidly to acquire the qualities desired by meat producers. For instance, in the wake of well-publicised health concerns associated with in the 1980s, the fat content of United Kingdom beef, pork and lamb fell from 20–26 percent to 4–8 percent within a few decades, due to both selective breeding for leanness and changed methods of . Methods of aimed at improving the meat production qualities of animals are now also becoming available.

Even though it is a very old industry, meat production continues to be shaped strongly by the evolving demands of customers. The trend towards selling meat in pre-packaged cuts has increased the demand for larger breeds of cattle, which are better suited to producing such cuts. Even more animals not previously exploited for their meat are now being farmed, especially the more agile and mobile species, whose muscles tend to be developed better than those of cattle, sheep or pigs. Examples are the various species, the , and , as well as non-mammals, such as the , and . Another important trend in contemporary meat production is which, while providing no benefit to meat so produced,Lawrie, 11, citing Ollson, V., Andersson, I., Ranson, K., Lundström, K. (2003) Meat Sci. 64, 287 and noting also that organically reared pigs "compare unfavourably" with conventionally reared ones "in some respects." meets an increasing demand for organic meat.

Growth and development of meat animals
has identified several factors bearing on the growth and development of meat in animals.

Reproductive efficiency2–10%
Meat quality15–30%
Muscle/fat ratio40–60%
Several economically important traits in meat animals are heritable to some degree (see the table to the right) and can thus be selected for by breeding. In cattle, certain growth features are controlled by which have not so far been controlled, complicating breeding. One such trait is ; another is the doppelender or "" condition, which causes and thereby increases the animal's commercial value. continues to reveal the genetic mechanisms that control numerous aspects of the and, through it, meat growth and quality.

techniques can shorten breeding programmes significantly because they allow for the identification and isolation of coding for desired traits, and for the reincorporation of these genes into the animal . To enable such manipulation, research is ongoing () to of sheep, cattle and pigs. Some research has already seen commercial application. For instance, a has been developed which improves the digestion of grass in the of cattle, and some specific features of muscle fibres have been genetically altered.

Experimental of commercially important meat animals such as sheep, pig or cattle has been successful. The multiple asexual reproduction of animals bearing desirable traits can thus be anticipated, although this is not yet practical on a commercial scale.

Heat regulation in livestock is of great economic significance, because mammals attempt to maintain a constant optimal body temperature. Low temperatures tend to prolong animal development and high temperatures tend to retard it. Depending on their size, body shape and insulation through tissue and fur, some animals have a relatively narrow zone of temperature tolerance and others (e.g. cattle) a broad one. Static , for reasons still unknown, also retard animal development.

The quality and quantity of usable meat depends on the animal's plane of nutrition, i.e., whether it is over- or underfed. Scientists disagree, however, about how exactly the plane of nutrition influences carcase composition.

The composition of the diet, especially the amount of protein provided, is also an important factor regulating animal growth. , which may digest , are better adapted to poor-quality diets, but their ruminal microorganisms degrade high-quality protein if supplied in excess. Because producing high-quality protein animal feed is expensive (see also below), several techniques are employed or experimented with to ensure maximum utilization of protein. These include the treatment of feed with to protect during their passage through the , the recycling of by feeding it back to cattle mixed with feed concentrates, or the partial conversion of to protein through microbial action.

In plant feed, environmental factors influence the availability of crucial or , a lack or excess of which can cause a great many ailments. In Australia, for instance, where the soil contains limited , cattle are being fed additional phosphate to increase the efficiency of beef production. Also in Australia, cattle and sheep in certain areas were often found losing their appetite and dying in the midst of rich pasture; this was at length found to be a result of deficiency in the soil. Plant are also a risk to grazing animals; for instance, , found in some African and Australian plants, kills by disrupting the . Certain man-made such as and some residues present a particular hazard due to their tendency to in meat, potentially poisoning consumers.

Human intervention
Meat producers may seek to improve the of female animals through the administration of or -inducing . In pig production, infertility is a common problem, possibly due to excessive fatness. No methods currently exist to augment the fertility of male animals. is now routinely used to produce animals of the best possible genetic quality, and the efficiency of this method is improved through the administration of hormones that synchronize the ovulation cycles within groups of females.

, particularly agents such as , are used in some countries to accelerate muscle growth in animals. This practice has given rise to the , an international trade dispute. It may also decrease the tenderness of meat, although research on this is inconclusive, and have other effects on the composition of the muscle flesh. Where is used to improve control over male animals, its side effects are also counteracted by the administration of hormones.

may be administered to animals to counteract stress factors and increase weight gain. The feeding of to certain animals has been shown to improve growth rates also. This practice is particularly prevalent in the USA, but has been banned in the , partly because it causes in microorganisms.

Biochemical composition
Numerous aspects of the biochemical composition of meat vary in complex ways depending on the species, breed, sex, age, plane of nutrition, training and exercise of the animal, as well as on the anatomical location of the musculature involved. Even between animals of the same litter and sex there are considerable differences in such parameters as the percentage of intramuscular fat.

Main constituents
Adult mammalian flesh consists of roughly 75 percent water, 19 percent protein, 2.5 percent intramuscular fat, 1.2 percent and 2.3 percent other soluble non-protein substances. These include compounds, such as , and inorganic substances such as minerals.

Muscle proteins are either soluble in water ( proteins, about 11.5 percent of total muscle mass) or in concentrated salt solutions ( proteins, about 5.5 percent of mass). There are several hundred sarcoplasmic proteins. Most of them – the glycolytic – are involved in the , i.e., the conversion of stored energy into muscle power. The two most abundant myofibrillar proteins, and , are responsible for the muscle's overall structure. The remaining protein m6ass consists of ( and ) as well as tissue.

Fat in meat can be either , used by the animal to store energy and consisting of "true fats" ( of with ), or intramuscular fat, which contains considerable quantities of and of constituents such as .

Red and white meat
Meat can be broadly classified as "red" or "white" depending on the concentration of in muscle fibre. When myoglobin is exposed to , reddish oxymyoglobin develops, making myoglobin-rich meat appear red. The redness of meat depends on species, animal age, and fibre type: contains more narrow muscle fibres that tend to operate over long periods without rest, while contains more broad fibres that tend to work in short fast bursts.

Generally, the meat of adult mammals such as , , , and is considered red, while and breast meat is considered white.

Nutritional information
Typical nutritional content of
110 grams (4 oz or .25 lb) of meat
All tissue is very high in protein, containing all of the , and in most cases is a good source of , , , , , , , and . Several forms of meat are high in 2, which is only otherwise known to be found in fermented foods, with having the highest concentration. Muscle tissue is very low in carbohydrates and does not contain dietary fiber. The fat content of meat can vary widely depending on the and of animal, the way in which the animal was raised, including what it was fed, the part of the body, and the methods of butchering and cooking. Wild animals such as are typically leaner than farm animals, leading those concerned about fat content to choose such as . Decades of breeding meat animals for fatness is being reversed by consumer demand for meat with less fat.

The table in this section compares the nutritional content of several types of meat. While each kind of meat has about the same content of protein and carbohydrates, there is a very wide range of fat content. It is the additional fat that contributes most to the calorie content of meat, and to concerns about dietary health.

Meat is produced by killing an animal and cutting flesh out of it. These procedures are called and , respectively. There is ongoing research into producing , that is, outside of animals.

Attesting to the long history of meat consumption in human civilizations, has become part of the practice of several religions. These rituals, as well as other pre-industrial meat production methods such as these used by , are not detailed here. This section will instead provide an overview of contemporary meat production in dedicated from cattle, sheep and pigs.

Upon reaching a predetermined age or weight, livestock are usually transported en masse to the slaughterhouse. Depending on its length and circumstances, this may exert stress and injuries on the animals, and some may die en route. Unnecessary stress in transport may adversely affect the quality of the meat. In particular, the muscles of stressed animals are low in water and , and their fails to attain acidic values, all of which results in poor meat quality. Consequently, and also due to campaigning by groups, laws and industry practices in several countries tend to become more restrictive with respect to the duration and other circumstances of livestock transports.

Animals are usually slaughtered by being first and then (bled out). Death results from the one or the other procedure, depending on the methods employed. Stunning can be effected through the animals with , shooting them with a or a , or shocking them with electric current. In most forms of , stunning is not allowed.

Draining as much blood as possible from the carcase is necessary because blood causes the meat to have an unappealing appearance and is a breeding ground for microorganisms. The exsanguination is accomplished by severing the and the in cattle and sheep, and the in pigs.

Dressing and cutting
After exsanguination, the carcass is dressed; that is, the head, feet, hide (except hogs and some veal), excess fat, and are removed, leaving only bones and edible muscle. Cattle and pig carcases, but not those of sheep, are then split in half along the mid ventral axis, and the carcase is cut into wholesale pieces. The dressing and cutting sequence, long a province of manual labor, is progressively being fully automated.

Under hygienic conditions and without other treatment, meat can be stored at above its freezing point (–1.5 °C) for about six weeks without spoilage, during which time it undergoes an aging process that increases its tenderness and flavor.

During the first day after death, continues until the accumulation of causes the to reach about 5.5. The remaining , about 18 g per kg, is believed to increase the water-holding capacity and tenderness of the flesh when cooked. sets in a few hours after death as is used up, causing and to combine into rigid and lowering the meat's water-holding capacity, causing it to lose water ("weep"). In muscles that enter rigor in a contracted position, actin and myosin filaments overlap and cross-bond, resulting in meat that is tough on cooking – hence again the need to prevent pre-slaughter stress in the animal.

Over time, the muscle proteins in varying degree, with the exception of the collagen and of , and rigor mortis resolves. Because of these changes, the meat is tender and pliable when cooked just after death or after the resolution of rigor, but tough when cooked during rigor. As the muscle pigment denatures, its iron , which may cause a brown discoloration near the surface of the meat. Ongoing also contributes to conditioning. , a breakdown product of ATP, contributes to the meat's flavor and odor, as do other products of the discomposition of muscle fat and protein.

When meat is industrially processed in preparation of consumption, it may be enriched with to protect or modify its flavor or color, to improve its tenderness, juiciness or cohesiveness, or to aid with its . Meat additives include the following: ξ4
  • is the most frequently used additive in meat processing. It imparts flavor but also inhibits microbial growth, extends the product's shelf life and helps finely processed products, such as sausages. Ready-to-eat meat products normally contain about 1.5 to 2.5 percent salt.
  • is used in to stabilize the meat's color and flavor, and inhibits the growth of spore-forming microorganisms such as . The use of nitrite's precursor is now limited to a few products such as dry sausage, or .
  • used in meat processing are normally alkaline such as . They are used to increase the water-binding and emulsifying ability of meat proteins, but also limit lipid oxidation and flavor loss, and reduce microbial growth.
  • or its equivalent (vitamin C) is used to stabilize the color of cured meat.
  • such as or impart a sweet flavor, bind water and assist surface browning during cooking in the .
  • impart or modify flavor. They include or extracted from them, , vegetables and .
  • such as impart or strengthen a particular flavor.
  • break down to make the meat more palatable for consumption. They include , acids, salt and phosphate.
  • Dedicated include , and , , acidified or , , activated , or , or such as .
  • include a wide range of chemicals that limit , which creates an undesirable "off flavor", in precooked meat products.
  • , most often lactic or citric acid, can impart a tangy or tart flavor note, extend shelf-life, tenderize fresh meat or help with protein and moisture release in dried meat. They substitute for the process of natural fermentation that acidifies some meat products such as hard or prosciutto.

Spoilage and preservation
The spoilage of meat occurs, if untreated, in a matter of hours or days and results in the meat becoming unappetizing, poisonous or infectious. Spoilage is caused by the practically unavoidable infection and subsequent of meat by and , which are borne by the animal itself, by the people handling the meat, and by their implements. Meat can be kept edible for a much longer time – though not indefinitely – if proper is observed during production and processing, and if appropriate , and procedures are applied. Without the application of and stabilizers, the fats in meat may also begin to rapidly decompose after cooking or processing, leading to an objectionable taste known as .

Methods of preparation
Fresh meat can be cooked for immediate consumption, or be processed, that is, treated for longer-term and later consumption, possibly after further preparation. A common additive to processed meats, both for preservation and because it prevents discoloring, is , which, however, is also a source of health concerns, because it may form when heated. ξ5

Meat is prepared in many ways, as , in , , or as like beef jerky. It may be ground then formed into patties (as or croquettes), loaves, or , or used in loose form (as in "sloppy joe" or ). Some meat is cured by , which is the process of , , or by exposing it to the from burning or smoldering plant materials, most often . In , is the traditional smoking wood, but is more often used now, and to a lesser extent. In , , , oak, , alder, , and fruit-tree woods are commonly used for smoking. Meat can also be cured by , preserving in or (see and other methods). Other kinds of meat are and , or simply boiled, , or .

Meat is generally eaten cooked, but there are many traditional recipes that call for raw beef, veal or fish (). is a meat dish made from finely chopped or minced or . ξ6 Raymond Sokolov, The Cook's Canon, 2003, ISBN 0-06-008390-5, p. 183 at Google Books Meat is often spiced or seasoned, particularly with meat products such as sausages. Meat dishes are usually described by their source (animal and part of body) and method of preparation (e.g., a beef rib).

Meat is a typical base for making . Popular varieties of sandwich meat include , , and other sausages, and , such as , , , , and . Meat can also be molded or pressed (common for products that include offal, such as and ) and .

Meat is part of the human diet in most cultures. Many people, however, choose not to eat meat (this is referred to as ) or any food made from animals (). The reasons for not eating all or some meat may include ethical objections to killing animals for food, health concerns, environmental concerns or religious .

Ethics of eating meat
Ethical issues regarding the consumption of meat can include objections to the act of killing animals or to the used in meat production. Reasons for objecting to killing animals for consumption may include , , or an aversion to inflicting or harm on other . Some people, while not vegetarians, refuse to eat the flesh of certain animals, such as cats, dogs, horses, or rabbits, due to cultural or religious . In some cases, specific meats (especially from pigs and cows) are forbidden within religious traditions.

Some people eat only the flesh of animals which they believe have not been mistreated, and abstain from the meat of animals reared in or from particular products such as and . Some people also abstain from milk and its derivatives because the production of veal is a byproduct of the dairy industry. The ethical issues with factory farming relate to the high concentration of animals, animal waste, and the potential for dead animals in a small space. Critics argue that some techniques used in intensive agriculture can be cruel to animals. Foie gras is a made of the of or that has been specially fattened by them corn. Veal is criticised because the veal calves may be highly restricted in movement; have unsuitable flooring; spend their entire lives indoors; experience prolonged sensory, social, and exploratory deprivation; and are more susceptible to high amounts of stress and disease.

Religious traditions
The religion of has always opposed eating meat, and there are also , and that condemn the eating of meat. dietary rules ( ) allow certain ( ) meat and forbid other ( ). Among the numerous laws that form part of kashrut are the prohibitions on the consumption of (such as , (both and ) and most ) and mixtures of meat and milk. Similar rules apply in . According to the , the only foods explicitly forbidden are meat from animals that die of themselves, blood, the meat of swine (porcine animals, pigs), and animals dedicated to other than Allah (either undedicated or dedicated to ).In only is forbidden and the proscribed method of killing is , however there are sects that oppose eating meat. ξ7

A study of 400,000 subjects conducted by the and published in 2013 showed "a moderate positive association between processed meat consumption and mortality, in particular due to cardiovascular diseases, but also to cancer."

A 1999 combined data from five studies from western countries. The metastudy reported , where lower numbers indicated fewer deaths, for fish eaters to be 0.82, vegetarians to be 0.84, occasional meat eaters to be 0.84. Regular meat eaters and vegans shared the highest mortality ratio of 1.00. The study reported the numbers of deaths in each category, and expected error ranges for each ratio, and adjustments made to the data. However, the "lower mortality was due largely to the relatively low prevalence of smoking in these vegetarian cohorts".

In response to changing prices as well as health concerns about saturated fat and cholesterol, consumers have altered their consumption of various meats. A USDA report points out that consumption of beef in the United States between 1970–1974 and 1990–1994 dropped by 21%, while consumption of increased by 90%. During the same period of time, the price of chicken dropped by 14% relative to the price of beef. In 1995 and 1996, beef consumption increased due to higher supplies and lower prices.

In recent years, health concerns have been raised about the consumption of meat increasing the risk of cancer. In particular, red meat and processed meat were found to be associated with higher risk of cancers of the , esophagus, liver, and , among others, although also a reduced risk for some minor type of cancers. Another study found an increase risk of pancreatic cancer for red meat and pork. That study also suggests that fat and saturated fat are not likely contributors to pancreatic cancer. Animal fat, particularly from ruminants, tends to have a higher percentage of vs. monounsaturated and polyunsaturated fat when compared to vegetable fats, with the exception of some tropical plant fats; consumption of which has been correlated with various health problems. The saturated fat found in meat has been associated with significantly raised risks of , although evidence suggests that risks of prostate cancer are unrelated to animal fat consumption.

However, many research papers do not support significant links between meat consumption and various cancers. Key et al. found that "There were no significant differences between vegetarians and nonvegetarians in mortality from cerebrovascular disease, stomach cancer, colorectal cancer, lung cancer, breast cancer, prostate cancer or all other causes combined."Key, T. J. , G. E. Fraser, M. Thorogood, P. N. Appleby, V. Beral, G. Reeves, M. L. Burr, J. Chang-Claude, R. Frentzel-Beyme, J. W. Kuzma, J. Mann and K. McPherson. 1999. Mortality in vegetarians and nonvegetarians: detailed findings from a collaborative analysis of 5 prospective studies. Am. J. Clin. Nutr. 70 (suppl.): 516S-524S Truswell reviewed numerous studies, concluding that the relationship of colorectal cancer with meat consumption appeared weaker than the "probable" status it had been given by the World Cancer Research Foundation in 1997.Truswell, A. S. 2002. Meat consumption and cancer of the large bowel. E. J. Clin. Nutr. 56: S19-S24. A study by Chao et al. (2005) found an apparent association of colorectal cancer with red meat consumption after adjustment for age and energy intake. However, after further adjustment for body mass index, cigarette smoking and other covariates, no association with red meat consumption was found.Chao, A., M. J. Thun, C. J. Connell, M. L. McCullough, E. J. Jacobs, W. D. Flanders, C. Rodriguez, R. Sinha and E. E. Calle. 2005. Meat consumption and risk of colorectal cancer. J. Am. Med. Assoc. 293: 172-182 Alexander conducted a meta-analysis which found no association of colorectal cancer with consumption of animal fat or protein.Alexander, D. D., C. A. Cushing, K. A. Lowe, B. Sceurman and M. A. Roberts. 2009. Meta-analysis of animal fat or animal protein intake and colorectal cancer. Am. J. Clin. Nutr. 89: 1402-1409 Based on European data (EPIC-Oxford study), Key et al. found that incidence of colorectal cancer was somewhat lower among meat eaters than among vegetarians.Key, T. J., P. N. Appleby, E. A. Spencer, R. C. Travis, A. W. Roddam and N. E. Allen. 2009. Cancer incidence in vegetarians: results from the European Prospective Investigation into Cancer and Nutrition (EPIC-Oxford). Am. J. Clin. Nutr. 89 (suppl.): 1620S-1626S A study within the European Prospective Investigation into Cancer and Nutrition found that association between esophageal cancer risk and total and processed meat intake was not statistically significant.Gonzalez, C. A. et al. 2006. Meat Intake and Risk of Stomach and Esophageal Adenocarcinoma Within the European Prospective Investigation Into Cancer and Nutrition (EPIC). J. National Cancer Inst. 98: 345-354 The dissimilar findings indicate that caution is needed in considering claims of dietary links to cancer occurrence.

Heart disease
The correlation of meat consumption to increased risk of is controversial. Some studies fail to find a link between red meat consumption and heart disease (although the same study found statistically significant correlation between the consumption of processed meat and cancer), while another study, a survey, conducted in 1960, of 25,153 California Seventh-Day Adventists, found that the risk of heart disease is three times greater for 45-64 year old men who eat meat daily, versus those who did not eat meat. A major Harvard University study [5] 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 eating 50g (less than 2oz) of processed meat per day increases risk of coronary heart disease by 42%, and diabetes by 19%. Equivalent levels of fat, including saturated fats, in unprocessed meat (even when eating twice as much per day) did not show any deleterious effects, leading the researchers to suggest that "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."

Bacterial contamination
A 2011 study by the showed that nearly half (47%) of the meat and in U.S. grocery stores were contaminated with , with more than half (52%) of those bacteria resistant to antibiotics. US Meat and Poultry Is Widely Contaminated With Drug-Resistant Staph Bacteria

Meat can transmit certain , but complete cooking and avoiding recontamination reduces this possibility.

Several studies published since 1990 indicate that cooking muscle meat creates (HCAs), which are thought to increase cancer risk in humans. Researchers at the National Cancer Institute published results of a study which found that human subjects who ate beef rare or medium-rare had less than one third the risk of stomach cancer than those who ate beef medium-well or well-done. While eating muscle meat raw may be the only way to avoid HCAs fully, the states that cooking meat below creates "negligible amounts" of HCAs. Also, meat before cooking may reduce HCAs by 90%.

, present in processed and cooked foods, have been noted as being carcinogenic, being linked to colon cancer. Also, toxic compounds called PAHs, or , present in processed, smoked and cooked foods, are known to be carcinogenic.

Environmental impact
Various environmental effects are associated with meat production. Among these are greenhouse gas emissions, fossil energy use, water use, water quality changes, and effects on grazed ecosystems. The occurrence, nature and significance of these effects varies among livestock production systems.Steinfeld, H. et al. 2006, Livestock’s Long Shadow: Environmental Issues and Options. Livestock, Environment and Development, FAO. Grazing of livestock can be beneficial for some wildlife species, but not for others.Holechek, J. L. et al. 1982. Manipulation of grazing to improve or maintain wildlife habitat. Wildlife Soc. Bull. 10:204-210.Strassman, B. I. 1987. Effects of cattle grazing and haying on wildlife conservation at National Wildlife Refuges in the United States. Environmental Mgt. 11: 35-44 Targeted grazing of livestock is used as a food-producing alternative to herbicide use in some vegetation management.Launchbaugh, K. (ed.) 2006. Targeted Grazing: a natural approach to vegetation management and landscape enhancement. American Sheep Industry. 199 pp. Meat-producing livestock can provide environmental benefits through waste reduction, e.g. conversion of human-inedible residues of food crops.Anderson, D. C. 1978. Use of cereal residues in beef cattle production systems. J. Anim. Sci. 46: 849-861.Elferink, E. V., S. Nonhebel and H. C. Moll. 2008. Feeding livestock food residue and the consequences for the environmental impact of meat. J. Cleaner Prod. 16: 1227-1233. Manure from meat-producing livestock is used as fertilizer; it may be composted before application to food crops. Substitution of animal manures for synthetic fertilizers in crop production can be environmentally significant, as between 43 and 88 MJ of fossil fuel energy are used per kg of nitrogen in manufacture of synthetic nitrogenous fertilizers.Shapouri, H. et al. 2002. The energy balance of corn ethanol: an update. USDA Agricultural Economic Report 814.

Imitation meat
Various forms of have been created for people who wish not to eat meat but still want to taste its flavor and texture. Meat imitates are typically some form of processed (, ), but they can also be based on or even fungus ().

With the rise of complex , including , in developed economies, the distance between the farmer or fisherman and customer has grown, increasing the possibility for intentional and unintentional misidentification of meat at various points in the supply chain.

In 2013, reports emerged across Europe that products labelled as containing beef actually contained horse meat. EU-wide Meat Testing for Horsemeat SGS Food Safety Bulletin, Retrieved 04/16/2013 Horse Meat Scandal Is ‘Food Fraud’ New York Times, Retrieved 04/17/2013 In February 2013 a study was published showing that about one-third of raw fish are misidentified across the United States.Juliet Eilperin and Tim Carman for the Washington Post. February 21, 2013. One-third of seafood mislabeled, study finds

See also

External links

    ^ (2024). 9781845691592, Woodhead Publishing Limited.
    ^ (2024). 9780849385667, . .
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    ^ (2024). 9780917678509, John Wiley & Sons.
    ^ (2024). 9780618658527, Houghton Mifflin Harcourt.
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