1. Health: Cowsâ stomachs are made to digest grass, not grains. Still, most slaughterhouses feed grains to their captives in order to avoid the costs associated with providing for grazing land. Due to this unnatural change in their diet, the poor animals become afflicted by many diseases. To counter these diseases, they are routinely administered antibiotics, which lead to the formation of antibiotic-resistant bacteria in their bodies. When we humans eat their flesh, those resistant bacteria enter our bodies and render ineffective the antibiotics we take. Referring to these resistant bacteria, food researcher John Robbins, author of the widely-acclaimed Diet For A New America: How Your Food Choices Affect Your Health, Happiness, and the Future of Life on Earth, states, âThese are the new âsuperbugsâ that are increasingly rendering our âmiracle drugsâ ineffective.â Anatomy: The following is an extract from the table The Comparative Anatomy of Eating, prepared by Milton R. Mills, M.D. 1 -Facial Muscles 2 - Jaw Type 3 - Jaw Joint Location 4 - Jaw Motion Carnivore Reduced to allow wide mouth gape Angle not expanded On same plane as molar teeth Shearing; minimal side-to-side motion Herbivore Well-developed Expanded angle Above the plane of the molars No shear; good side-to-side, front-to-back Omnivore Reduced Angle not expanded On same plane as molar teeth Shearing; minimal side-to-side Human Well-developed Expanded angle Above the plane of the molars No shear; good side-to-side, front-to-back 5 - Mouth Opening vs. Head Size 6 - Teeth (Canines) Carnivore Large Long, sharp and curved Herbivore Small Dull and short or long (for defense), or none Omnivore Large Long, sharp and curved Human Small Short and blunted 7 - Teeth (Molars) 8 â Chewing 9 - Saliva Carnivore Sharp, jagged and blade shaped None; swallows food whole No digestive enzymes Herbivore Flattened with cusps vs complex surface Extensive chewing necessary Carbohydrate digesting enzymes Omnivore Sharp blades and/or flattened Swallows food whole and/or simple crushing No digestive enzymes Human Flattened with nodular cusps Extensive chewing necessary Carbohydrate digesting enzymes 10 - Stomach Acidity 11 - Stomach Capacity 12 - Length of Small Intestine 13 - Colon Carnivore Less than or equal to pH 1 with food in stomach 60% to 70% of total volume of digestive tract 3 to 6 times body length Simple, short and smooth Herbivore pH 4 to 5 with food in stomach Less than 30% of total volume of digestive tract 10 to more than 12 times body length Long, complex; may be sacculated Omnivore Less than or equal to pH 1 with food in stomach 60% to 70% of total volume of digestive tract 4 to 6 times body length Simple, short and smooth Human pH 4 to 5 with food in stomach 21% to 27% of total volume of digestive tract 10 to 11 times body length Long, sacculated 14 - Liver 15â Kidney 16 - Nails Carnivore Can detoxify vitamin A Extremely concentrated urine Sharp claws Herbivore Cannot detoxify vitamin A Moderately concentrated urine Flattened nails or blunt hooves Omnivore Can detoxify vitamin A Extremely concentrated urine Sharp claws Human Cannot detoxify vitamin A Moderately concentrated urine Flattened nails Mother Nature could hardly have made a clearer statement about what sort of diet is natural for humans than what she has already done through the features of human anatomy. Nutrition Let us now examine the common notion that if humans donât eat meat, they will suffer from protein deficiency. Commenting on this idea, The Physicians Committee for Responsible Medicine (PCRM), a non-profit organization based in Washington, D.C. and comprised of 4,500 medical doctors, state,âHigh protein diets are unhealthy. However, adequate but not excess amounts of protein to maintain body tissues, including muscle, are still important and can be easily achieved on a vegetarian diet.â PCRM points out that the excess proteins resulting from a meat-centered diet contribute to osteoporosis, cancer, heart disease, and impaired kidney functioning. For adequate protein intake, PCRM recommends the following vegetarian protein sources: Healthy Protein Sources (in grams) Black beans, boiled (1 cup) 15.2 Broccoli (1 cup) 4.6 Bulgur, cooked (1 cup) 5.6 Chickpeas, boiled (1 cup) 14.5 Lentils, boiled (1 cup) 17.9 Peanut butter (2 tbsp) 8.0 Spinach, boiled (1 cup) 5.4 Whole wheat bread (1 slice) 2.7 And yet, we may still have a residual doubt: Will a vegetarian diet give us sufficient physical strength? Why not? If a vegetarian diet gives elephants, rhinoceroses, and hippopotamuses their super-human strength, why would it not provide us with our normal human strength? Disease In his Pulitzer Prize-nominated book How to Survive in America,The Poisoned, Lewis Regenstein writes,âMeat contains approximately 14 times more pesticides than do plant foods. . .Thus, by eating foods of animal origin, one ingests greatly concentrated amounts of hazardous chemicals.â Naturally, these chemicals cause many diseases in meat-eaters. Letâs look at just two of them. Heart disease:Numerous studies have confirmed that heart disease is initiated or aggravated bya meat-centered diet. This verdict is so unequivocal and unanimous that that William Castelli, M.D., director of the Framingham Heart Study, the longest-running clinical study in medical history, declared, âIf Americans adopted a vegetarian diet, the whole thing [the heart disease epidemic] would disappear.â Cancer: Dr. T. Colin Campbell, one of the worldâs foremost epidemiological researchers, announces, âHuman studies also support this carcinogenic effect of animal protein, even at usual levels of consumption. . . .No chemical carcinogen is nearly so important in causing human cancer as animal protein.â  The medical costs of meat consumption â based on 1992 data, but inflated to 2011 dollars and accounting for increases in medical costs âare estimated at approximately $60 billion to $130 billion annually. If only five percent of these costs were saved, it would amount to $30 billion to $65 billion over a ten-year period. 2. Environment: Assembly-line meat factories (a euphemism for hi-tech slaughterhouses) cause enormous pollution of water-bodies. In a New York Times article (2008/01/27), specialist food writer Mark Bittmanstates stated, âIn Iowa [USA] alone, hog farms and hog factories produce more than 50 million tons of excrement.â Moreover, these meat factories also generate alarming amounts of greenhouse gas. Eminent environmentalist R K Patchauri, Chairman of the Intergovernmental Panel on Climate Change, reports in The Impact of Meat Production and Consumption on Climate Change, âA Japanese study estimated that 2.2 pounds of beef emits as much carbon dioxide as is emitted by the average European car every 155 miles.â He further points out, âThe UN Food and Agriculture Organization (FAO) has estimated that direct emissions from meat production account for about 18% of the worldâs total greenhouse gas emissions.â The environmental fallouts of assembly-line meat factories donât end with water and air pollution; they extend far beyond to include the consumption of enormous amounts of energy and the consumption of ever-increasing amounts of grain, thus leading to staggering deforestation.