For those of you interested in the Raw Food movement you may find these articles of interest.
Cooking and Cognition: How Humans Got So Smart
Metabolic changes in schizophrenia and human brain evolution
The Raw Food Diet: A Raw Deal
The first two (the Second is a paper I'll read properly late and likely comment on a bit more then) suggest that there may have been a link between the discovery of Cooking and the development of Human intelligence as it made more energy available for use by the brain.
The Second has a quick look at the Raw food diet and points out a couple of problems with it. When considered together it makes for an interesting look at human cognition and the possible effects that changes in diet can have.