Food For Thought: Meat-Based Diet Made Us Smarter

http://www.npr.org/templates/story/story.php?storyId=128849908

Our earliest ancestors ate a diet of raw food that required immense energy to digest. But once we started eating nutrient-rich meat, our energy-hungry brains began growing and our guts began to shrink. Cooking that food not only made it safer, but also easier to digest.