The evolutionary role of cookery

The Economist had an article not so long ago about cooking and its role for the evolution of humans, here.
Several interesting to note:
- Pre-agricultural man confined to raw food would have starved.
- Heat physically softens food. That makes it easier to digest, so even though the stuff is no more calorific, the body uses fewer calories dealing with it.
- The more processed food you eat, the more calories you have to store compared to the same intake of calorie with raw food.