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As Gallagher (Everything I Need To Know I Learned from Other Women) points out here, there is no simple answer to the titular question, although most people have asked it. The crux of the problem: People tend to allow short-term concerns (e.g., hunger) to outweigh long-term self-interests (e.g., exercising). Gallagher elaborates on why and then provides 52 ways to override human tendencies, including going on a media fast. Her clear, practical treatment of a common but rarely tackled problem elevates this book above the usual self-help dreck.