Our forefathers didn't claw their way to the top of the food chain in order for us to eat our vegetables. We're carnivores by design.
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In fact, according to a recent documentary I saw, becoming carnivorous was an evolutionary advantage, for a couple of reasons. First of all, the meat-eating humans could move out of Africa to a variety of other locales, since "their food moved with them". Contrast this to the humans that couldn't because they could only eat vegetation specific to the area.
Also I believe there were nutritional benefits. There were a couple of other reasons I can't remember.
My husband likes to tease me that I am evolutionarily regressing as I am vegetarian. :D Oh well.
"Also I believe there were nutritional benefits."
I'm pretty sure that, before the invention of vitamin pills, meat was probably the best way to ingest a good variety of vitamins. To put it simply, let the animal roam the environment, eating all sorts of different plants, each with a few vitamins and minerals. Then eat the animal and get it all at once. Since the invention of vitamin pills, I think the nutritional rationale for meat eating is weaker.