The Limits Of Willpower

Jonah Lehrer sketches them:

The lesson is that the prefrontal cortex can be bulked up, and that practicing mental discipline in one area, such as posture, can also make it easier to resist Christmas cookies. And when a dangerous desire starts coming on, just remember: Gritting your teeth isn't the best approach, as even the strongest mental muscles quickly get tired. Instead, find a way to look at something else.