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We\\u2019ve heard it a million times: \\u201cEat a well-balanced diet with everything in moderation.\\u201d After all these decades of clear failure, it\\u2019s a hazy clich\\xe9 still delivered by physicians, dietitians and nutritional \\u201cexperts\\u201d with earnest assurance. The same goes for exercise and stress. Moderate amounts of stress are okay, moderate cardiovascular work is good, etc. We accept the concept of moderation so readily, I think, because it sounds so rational and simple. If we follow common sense, moderation suggests, we\\u2019ll be fine. But if it were that easy, most people would be healthy\\u2014and statistics on the rising rates of obesity and chronic illness tell us otherwise. So what\\u2019s the problem?