Many people believe they could improve their lives if only they had more of that mysterious thing called willpower. With more self-control we would all eat right, exercise regularly, avoid drugs and alcohol, save for retirement, stop procrastinating, and achieve all sorts of noble goals. Take, for example, the results of the American Psychological Association’s annual Stress in America Survey. The survey asks, among other things, about participants’ abilities to make healthy lifestyle changes. Survey participants regularly cite lack of willpower as the No. 1 reason for not following through with such changes.