Quote Originally Posted by IAN 2411 View Post
I am not sure, but you can tell me if I’m wrong, but I am sure that I read somewhere that we need the nourishment from meats for us to survive. The only way that we could survive as a race without meat would be for the whole population to evolve a little at a time in that direction.
I think you're right and I think it would be enough if the female half of the population would evolve in that direction. Not having periods and thus loosing valuable blood and iron would be a good start, because it's rather difficult to get enough iron without meats. Same goes for vitamin B12 (cobalamin).
Of course, not having periods would pretty much put a stop to the evolution of humans...