The psychology and physiology of willpower is not only extremely interesting, but also necessary knowledge if you want to quit your favorite problematic behavior, if you want to really start loosing weight, or if you're try to motivate yourself to do the thing you always dreamt on doing. Also well written and scientifically researched.
The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do To Get More of Itvon Kelly McGonigalAvery