With all the discussion about raw foods, folks might find this article about
how fire may have shaped human evolution interesting. The author, a professor at Western Washington University, attributes a lot of our characteristics--small mouths, puny dentition, big brains, and shorter guts--to millions of years of eating cooked food.
I don't know if he's on the right track about a "fire ecology," but it's hard to argue that we just aren't constructed to eat the same diet as other current primates. We don't have the massive jaw musculature, big teeth, and long intestinal tracts it takes to eat an exclusively raw diet. And as Kaplods mentioned, even the apes in question don't eat exclusively raw fruits and vegetables.
Not to rain on anyone's parade here and if folks want to try the raw thing, that's their choice. I'm just personally dubious that it's a necessary or good thing for us, given our anatomy and physiology.