>If prehistoric humans didn't get their calories from protein, how do you suggest they got them? Probably mostly from plants. http://blogs.scientificamerican.

>If prehistoric humans didn't get their calories from protein, how do you suggest they got them? Probably mostly from plants. http://blogs.scientificamerican.com/guest-blog/2012/07/23/human-ancestors-were-nearly-all-vegetarians/ http://blogs.scientificamerican.com/guest-blog/2012/07/23/hu...