Just to clarify, I am talking about natural exercise and natural non-stress :) In their small communities you get stress and excrete it, while in the average larger community you accumulate it. It is the background "stress radiation", low intensity nagging stress, that does all kinds of nasty things to us - more accurately, we do it to ourselves and each other. Similarly, I would not equate time in the gym or jogging in Manhattan to their exercise.

I don't know if by some fluke they have the perfect 3-6 ratio in their diets, but if you get your fresh food and exercise (and those beneficial worms ;) ), it does not matter.