umm, I firmly believe that humans are, in fact, carnivores. to attempt to survive on a vegetarian diet is IMNSHO to deny the truth.
No, humans are omnivores, we naturally consume both meat and vegetables. We can survive healthily and happily on not only a meat-free, but entirely animal product-free diet. Many cultures have been doing so for centuries.
I think that while many people can, I do think we have to respect the fact that some may have conditions that prevent it. As I said before...I truly believe it would be medically inadvisable for me to attempt a diet that didn't involve some sort of meat or animal products. In my case there are a lot of fruits and vegetables I
cannot eat, or not in sufficient quantities, without getting sick. That's even with medication. It would be either that or take tons and TONS of supplements to make up what I couldn't get the normal way.
Even if we as a culture reduced our meat-eating habits, I think there are some people who will not be able to cut it from their diets, and telling them not to eat meat would be like trying to force a lion to live off of leaves.