You won't catch John Durant in a tie. Shoes are optional, too. He has traded cubicle life for something a little wild: Promoting the diet and lifestyle of our ancestors from the paleolithic era. He's blogging and writing a book about his approach.
"For millions of years, we didn't have an obesity problem because we ate foods that our metabolism was adapted to," Durant says — foods such as root vegetables, tubers, fish and, of course, red meat.