Cooking and human evolution.

     Humans doubled their brain size in a relatively short period of time around two million years ago. The theory has been that this occurred due to human ability to run long distances and hunt and eat meat. They must have had meat to fuel the brain expansion, right?
     A competing theory is now in place which sounds much more likely.  Humans discovered fire much earlier than previously thought.  It was the ability to cook that may be responsible for the brain expansion. Cooking allowed for more nutrients to be metabolized from tough fibers, plus the fire kept dangerous predators at bay allowing better sleep.
     I wonder how today's nutrition is fueling future human evolution?

http://running.competitor.com/2014/01/injury-prevention/are-we-really-born-to-run_93817