We Americans may reside in the greatest nation on earth, but our lifestyle is killing us. Onequarter of us still smoke, two-thirds of us are fat, three-quarters of us don't exercise, and stress and depression are ubiquitous. We wolf down oversize portions of fast food in minutes and boast of not having taken a vacation in years. We get misinformation like "olive oil is healthy" but then get fatter because drizzling three tablespoons of oil on a salad adds as many calories as two scoops of premium ice cream. Despite all our advances in drugs and surgery, obesity and the diseases it causes have...