There seems to be a growing movement called Hunter-gatherer or paleo or caveman, where people try to recreate the diet and lifestyle of prehistoric tribes.
I find it very interesting. They eat lots of meat and vegetables, but only very seldomly, sometimes fasting for 24-36 hours between feasts, to replicate the diet of prehistory. Bread and other grain based food is forbidden because it was only developed after the development of agriculture. This also applies to the cows they eat, preferring grass-fed rather than corn-fed beef.
For exercise, modern cavemen practice full-body workouts, like running, sprinting, jumping and throwing rocks. They emphasize moving naturally and being barefoot.
Here are a few links http://www.nytimes.com/2010/01/10/fashion/10caveman.html
Nice report of the movement in NYChttp://www.colbertnation.com/the-colbert-report-videos/263270/febru...
a colbert interview with one of these New York Cavemenhttp://movnat.com/
Moving Naturally. A site advocating natural full-body movements for exercise.