Willpower, often stretched to its limits to resist junk food, alcohol or a forbidden relationship, operates like a muscle that is fueled by glucose, fatigued when overused and strengthened with practice, said social psychologist Roy Baumeister at a recent Elmhurst lecture.

Together with intelligence, the ability to exert self-control is the best predictor of a happy, satisfying and successful life, Baumeister told a packed audience in the Founders Lounge of the Frick Center on September 27. The talk was part of the College's Science, Technology and Society lecture series.

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