The Paleo diet is modeled after the foods that early man had available: meats, fruits, no processed foods, etc… the foods that were around 20,000 years ago. The foods we evolved to digest.

Why is that supposed to be healthy? What was the life expectancy of a Paleo man? Didn’t they get much more exercise than we do today? Should the Paleo diet also require more exercise and living in an uncontrolled temperature environment as well?
I don’t get it. What am I missing?