Not completely, but substantially off topic... re: the caveman diet, now researchers are beginning to look at what microbes are in our guts, which ones adapted to what your ancestors on continent x were eating, that now either hinder or help digestion in your present day gut.

http://www.huffingtonpost.com/2012/07/23/ancient-humans-vegetarians-paleolithic-diet_n_1695228.html

eats, leaves and bugs!