A new book on willpower asserts that it's a muscle. That is, you can strengthen it with practice, and you can exhaust it with stress and overuse. This makes sense, and years of research back the idea.

These are comments I might get when people learn about my lifestyle. I’m one of those annoying people who eat lots of fruits and vegetables, exercise five times a week, save a portion of their salary, ...

Losing weight is extremely difficult because high-calorie, delicious food is very accessible. Despite best intentions, it’s common to wind up overeating. These setbacks can be frustrating and ...