Friday, May 23, 2014

The Straight Dope: Are humans meat eaters or vegetarians by nature?


Listen, wimp — whoops, too aggressive. Gimme some of that tofu burger. Ah, I can feel the testosterone receding already. Now then, let us reason like gentlemen. There are some intelligent arguments for vegetarianism, but claiming that man is "naturally" herbivorous isn't one of them. The settled judgment of science is that man is an omnivore, capable of eating both meat and vegetables, much as certain four-year-olds might like to convince their mothers otherwise.

Like the hard-core carnivores, we have fairly simple digestive systems well suited to the consumption of animal protein, which breaks down quickly. Contrary to what your magazine article says, the human small intestine, at 23 feet, is a little under eight times body length (assuming a mouth-to-anus "body length" of three feet). This is about midway between cats (three times body length), dogs (3-1/2 times), and other well-known meat eaters on the one hand and plant eaters such as cattle (20 to 1) and horses (12 to 1) on the other. This tends to support the idea that we are omnivores.

---Steve

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