I am not a vegetarian, nor am I a die hard meat eater. I do believe humans are omnivorous, but that said I think humans were not meant to eat the flesh of other animals, except maybe fish. There has been plenty of scientific research on the subject, much of which has concluded the following major points, which I agree with:
1) No carnivore in nature eats cooked or prepared meat of any kind
2) Carnivorous animals have a significantly shorter digestive tract, which enables them to process meat faster and more efficiently, eliminating the risk of constipation and internal putrification (something that happens to a lot of people who eat way to much red meat)
3) Look at our teeth. Look at a tiger's teeth. Big difference.
4) Apes (our closest mammalian relatives) do eat a "meat" of sorts. But not the "meat" we are used to. They eat insects, along with their fruits & veggies. Although, I do believe there are some lesser Asian primates that are carnivorous to an extent.
Anyway, when it comes down to it, I think we are meant to eat fruit, veggies and probably worms and other inverts, but not pigs, cows, goats and birds of any kind. I really don't know about humans eating fish, but without manmade tools, fish would most certainly not be on the menu either. But then again, why the heck does lobster taste so darn good if we weren't meant to eat it? And if we weren't meant to eat meat why do our brains give us the ability to find a way to do so? But that is an entirely different issue...
Bart