Cooking ... the brain

"Brains demand exceptional amounts of energy," says Ed Yong at Discover Magazine — energy that raw food simply can't provide. That's where cooking comes in.
Writes Yong:
Our ancestors overcame this constraint when they learned how to cook. Cooked food offers more calories than raw food, and is easier to chew and digest. These early chefs could gain more energy from the same amount of eating time. That, in turn, fueled more neurons and larger brains.

Read the interesting article The Week
http://theweek.com/article/index/235334/cooking-the-secret-to-the-evolution-of-the-human-brain