![]() Northwestern University’s Daniel Molden is among the skeptics. This model of self-control has been tremendously influential, but not all scientists are convinced it’s the whole story. What’s more, proponents of this theory have reported evidence that the brain-again like a muscle-is fueled primarily by simple carbohydrates, like sugar, and that depleted willpower can be replenished simply by refueling. Many studies have demonstrated that an act of mental exertion can compromise subsequent acts of discipline. And according to the energy model, these lapses occur when one act of self-control weakens our resolve, leaving us “fatigued” as we face another challenge. Nobody is disciplined all the time we all have lapses. According to this model, the brain is like a muscle, with a limited supply of strength, which can be depleted through exertion. One of the reigning theories of willpower is what’s called the energy model of self-control. What exactly is going on in the mind’s cognitive machinery-and the brain’s neurons-when we successfully summon our will-or when we say, oh the hell with it? So it’s no wonder that psychological scientists have been studying willpower for decades, trying to figure out who is disciplined under what circumstances-and why. And, of course, failures of self-control can sabotage all those goals. ![]() Willpower allows us to say no to that tempting cigarette, extra dessert, or second glass of whiskey-and to hop on the treadmill. It helps us to keep our heads down, studying and working when we really don’t feel like it, to earn that degree or promotion. ![]() Willpower is what makes us save for the future rather than splurge now. Willpower is the key to much that’s good in life.
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