I was having an on-line debate with vegetarian who claimed that the human body was not adapted to eating meat. As proof, he offered up that our teeth are too dull and our intestines are too long, and besides, if you'd just look at the studies, meat eaters have higher rates of cancer (and erectile dysfunction, for some reason he kept bringing that symptom up, it was odd) than vegetarians.
I countered with that fact that my incisors are pretty good at cutting meat, that my stomach produces enzymes that break down components that are found only in meat, and that there's no vegetable that offers complete protein, and a purely vegetarian diet is easy to have iron, B12 and protein deficiencies. Also that bacon cooking is the best smell ever. Your body knows what it wants, and it wants pot roast.
The cancer studies? I'll gladly give him the point that vegetarians are going to have lower rates of cancer than someone who eats processed meat, fast food, gets no fiber and thinks ketchup is a vegetable. Find me a bunch of twins who lead identical lives as far as exercise and environment, but where one is vegetarian and the enjoys a grass-fed steak now and then, a farm fresh egg for breakfast on Sundays and pastured chicken a few times a week and we can compare cancer rates and I'd be willing to bet they'd be identical.
My opponent and I did have some common ground, we both think CAFO's are horrible. We both think that large beef processing plants are evil. I'll even go so far as to grant him that the world would be better off if we ate less beef. But stop eating meat? That's cutting off your nose to spite your face.
Speaking of faces - that's another argument isn't it, 'I wont eat anything with a face'. Well that's just stupid. Cockroaches have faces, how do you feel about killing them? And roaches are pretty closely related to shrimp and crayfish, and from there it's a very short hop to lobster.
My theory is that vegetarians are just picky eaters. Like some sort of spoiled brats that won't eat their dinner.
God went to a lot of work to give us cows. Some plantets don't have any cows.