Diets don't work. Why not? Because they focus on what foods we should and shouldn't eat but completely ignore everything else that makes us fat. Look at your own situation: You say you want to lose weight, but you just can't stop indulging. You say you'd exercise more if only you had the time, yet you spend precious hours every night in front of the TV doing what? Munching nutrition-free snacks and drinking supersized beverages.

Peter Walsh, the bestselling author of It's All Too Much: An Easy Plan for Living a Richer Life with Less Stuff, believes that the secret to successfully...