edge.org interviews daniel lieberman. of particular note:
... there's a reversal of class today. Now, it's only the very wealthy who can afford to be physically active and to eat a good diet, and it's the lower classes, the people in the working classes that cannot afford to actually be physically active. People who are well-off, the one-percenters or maybe the five-percenters of our country, can afford to go to health clubs and take yoga classes and buy organic food. But most Americans today, particularly those who are in the working class, have to work all day long, they have to commute long hours. They don't have time to exercise; they can't afford to buy food that's very healthy. The result is that there's now an interesting reversal that never occurred before in human evolution, which is that the wealthier you are, the healthier you are.and
We love comfort, and people make a lot of money selling us comfort, but I would challenge the notion that comfort is usually good for us.the meditations and the care of the self are two interesting books to think about here, as is the influence of weather on the development of moral fibre.