Anyone who thinks that people cannot live without meat should read the Health arguments section at this url:
http://en.wikipedia.org/wiki/Veganism
Health arguments
Further information: Vegan nutrition and Raw veganism
Winston Craig, chair of the department of nutrition at Andrews University, writes that vegan diets tend to be higher in dietary fibre, magnesium, folic acid, vitamin C, vitamin E, iron, and phytochemicals, and lower in calories, saturated fat, cholesterol, long-chain omega-3 fatty acids, vitamin D, calcium, zinc, and vitamin B12.
According to the 2010 Dietary Guidelines for Americans, a report issued by the U.S. Department of Agriculture and the U.S. Department of Health and Human Services, a vegetarian diet is associated with lower levels of obesity and reduced risk of cardiovascular disease. The American Dietetic Association and Dietitians of Canada said in 2003 that properly planned vegan diets were nutritionally adequate for all stages of life, including pregnancy and lactation, and provided health benefits in the treatment and prevention of certain diseases. The Swiss Federal Nutrition Commission and the German Society for Nutrition do not recommend a vegan diet, and caution against it for children, the pregnant, and the elderly.
Dean Ornish is one of a number of physicians who recommend a low-fat vegan diet to prevent and reverse certain degenerative diseases.
Physicians John A. McDougall, Caldwell Esselstyn, Neal D. Barnard, Dean Ornish, Michael Greger, and nutritional biochemist T. Colin Campbell, argue that high animal fat and protein diets, such as the standard American diet, are detrimental to health, and that a low-fat vegan diet can both prevent and reverse degenerative diseases such as coronary artery disease and diabetes. A 2006 study by Barnard found that in people with type 2 diabetes, a low-fat vegan diet reduced weight, total cholesterol, and LDL cholesterol, and did so to a greater extent than the diet prescribed by the American Diabetes Association.
The 12-year Oxford Vegetarian Study of 11,000 subjects recruited between 1980 and 1984 indicated that vegans had lower total- and LDL-cholesterol concentrations than did meat-eaters. Death rates were lower in non-meat eaters than in meat eaters; mortality from ischemic heart disease was positively associated with eating animal fat and with dietary cholesterol levels.
According to the American Dietetic Association and Dietitians of Canada, diets that avoid meat tend to have lower levels of saturated fat, cholesterol, and animal protein, and higher levels of carbohydrates, fiber, magnesium, potassium, folate, and antioxidants, such as vitamins C and E, and phytochemicals. People avoiding meat are reported to have lower body mass index than those following the average Canadian or American diet. From this follows lower death rates from ischemic heart disease, lower blood cholesterol levels, lower blood pressure, and lower rates of hypertension, type 2 diabetes, and prostate and colon cancers.
A 1999 meta-analysis of five studies comparing mortality rates in Western countries found that mortality from ischemic heart disease was 26 percent lower in vegans than in regular meat-eaters. This was compared to 20 percent lower in occasional meat eaters, 34 percent lower in pescetarians (those who ate fish but no other meat), and 34 percent lower in ovo-lacto vegetarians (those who ate no meat, but did consume animal milk and eggs). The lower rate of protection for vegans compared to pescetarians or ovo-lacto vegetarians is believed to be linked to higher levels of homocysteine, caused by insufficient vitamin B12; it is believed that vegans who consume sufficient B12 should show even lower risk of ischemic heart disease than lacto-ovo vegetarians. No significant difference in mortality was found from other causes.
A large 15-year survey that investigated the association between diet and age-related cataract risk in the UK found that vegans had a 40 percent lower risk of developing cataract compared with the biggest meat eaters.
The American Dietetic Association indicated in 2003 that vegetarian diets may be more common among adolescents with eating disorders, but that the evidence suggests that the adoption of a vegetarian diet does not lead to eating disorders, rather that "vegetarian diets may be selected to camouflage an existing eating disorder." Other studies and statements by dietitians and counselors support this conclusion.