Although some historians and anthropologists say that man is historically omnivorous, our anatomical equipment ­ teeth, jaws, and digestive system ­ favors a fleshless diet. The American Dietetic Association notes that "most of mankind for most of human history has lived on vegetarian or near-vegetarian diets."

And much of the world still lives that way. Even on most industrialized countries, the love affair with meat is less than a hundred years old. It started with the refrigerator car and the twentieth-century consumer society. But even with the twentieth century, man's body hasn't adapted to eating meat. The prominent Swedish scientist Karl von Linne states, "Man's structure, external and internal, compared with that of the other animals, shows that fruit and succulent vegetables constitute his natural food." The chart below compares the anatomy of man with that of carnivorous and herbivorous animals.

Meat-eaters: have claws

Herbivores: no claws

Humans: no claws


Meat-eaters: have no skin pores and perspire through the tongue

Herbivores: perspire through skin pores

Humans: perspire through skin pores


Meat-eaters: have sharp front teeth for tearing, with no flat molar teeth for grinding

Herbivores: no sharp front teeth, but flat rear molars for grinding

Humans: no sharp front teeth, but flat rear molars for grinding


Meat-eaters: have intestinal tract that is only 3 times their body length so that rapidly decaying meat can pass through quickly

Herbivores: have intestinal tract 10-12 times their body length.

Humans: have intestinal tract 10-12 times their body length.


Meat-eaters: have strong hydrochloric acid in stomach to digest meat

Herbivores: have stomach acid that is 20 times weaker than that of a meat-eater

Humans: have stomach acid that is 20 times weaker than that of a meat-eater


Meat-eaters: salivary glands in mouth not needed to pre-digest grains and fruits.

Herbivores: well-developed salivary glands which are necessary to pre-digest grains and fruits

Humans: well-developed salivary glands, which are necessary to pre-digest, grains and fruits


Meat-eaters: have acid saliva with no enzyme ptyalin to pre-digest grains

Herbivores: have alkaline saliva with ptyalin to pre-digest grains

Humans: have alkaline saliva with ptyalin to pre-digest grains


Based on a chart by A.D. Andrews, Fit Food for Men, (Chicago: American Hygiene Society, 1970)


Clearly if humans were meant to eat meat we wouldn't have so many crucial ingestive/digestive similarities with animals that are herbivores.

Many people ask me, "If we weren't supposed to eat meat than why do we?". It is because we are conditioned to eat meat. Also, the ADA (American Dietetic Association) tells us that "most of mankind for most of human history has lived on a vegetarian or Lacto-ovo vegetarian diet.

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