Was just surfing around and found this excellent video. Just had to do a fast share.
And it's ohh so hilarious in how it hits on the rawfoodists. Good science meets good humour. Go Harvard!!!!
All in all: the Australopithecus discovered fire >> got more energy with less effort. In Homo Erectus that development can be seen as a smaller gut. Smaller gut = less energy spent in digestion = more energy to grow a larger brain = the development into Homo Sapiens.
Check it out here
cooking meat made us human