Is it true that about all humans?

"You could not live in nature as a vegetarian. Man kind would die out without B vitamins.. It is a proven fact that lack of B vitamins in women leads to serious birth defects. Without supplements veg heads couldnt even reproduce healthy offspring. The same is true of chimps (our closest living relative). Chimps that hunt and consume meat produce offspring with a much higher survival rate than those that do not. Furthermore that intelligence boom of the last 20k years is directly linked to the advent of stone tools for hunting. You owe your brains to our ancestors hunting and consumption of meat that is rich in B vitamins.. which is what boosted our brains to what they are today. Instead of getting bias bullshit info from vegan sites you need to check papers published by colleges and actual experts. What you find might shock you back into reality. "