It is, of course, quite obvious that humans are true omnivores, a lot like chimpansees. Apart from the blatant and un-ignorable fact that our bodies handle both meats and plants quite well, you can simply see how the remnants of peoples' living styles (I'm talking Inuit, Aboriginals, Masai, etc) of old clearly favour a balanced meat and vegetable diet (with the exception of the Inuit of course, since not much will grow on the polar cap. Instead, they survive on eating practically everything that's on a seal, sometimes even a whale and, of course, plenty of fish).
Another simple fact is that in meat and fish are a large amount of vitamins and minerals that are not or barely found in vegetables and fruits. Now, these days, anno 2007, it may be possible to put together a diet that compensates for such things, but about 10000 years back, you didn't have a choice. Humans did not have the know-how, the technology and most of all, not the time to go all Atkins on your ass and compile a huge encyclopedia on how to sustain yourself on nothing but greeneries. If you tried to be a moral knight back then, you'd last about 2 months before your ass was dead from malnourishment.
The moral question aside, even a mute, blind, amputee with Down syndrome can understand that humans are, by nature, omnivorous.
Why a reasonably smart dude like Militant is debating against this I cannot quite comprehend. Sometimes even the smart are swayed by rhetoric, wrong facts and a failure to see the big picture. Regardless, Militant, you should change your name back because Casey Rain sounds like a 3 dollar porno slut. Seriously, man.