I saw this article on Zawodny’s blog (I read his blog off an on). It is an interesting read.
Essentially, Going Ape talks about a BBC show where they take some people and put them into a zoo. They are given an ape diet for the duration. The results are illuminating.
Their findings coincides with some of the stuff I’ve read in earlier books. They just never marketed or tested their ideas in such an entertaining (digestable?) way.