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The science behind calories in minus calories out equals results, explained without jargon.

• How Your Body Stores and Burns Fat

  What happens to the calories you eat: how your body turns extra energy into stored fat, and how it gets that fat back out when you eat less than you burn.

• Diet vs. Dieting: Why One Lasts and the Other Doesn't

  Everyone has a diet, but not everyone is dieting. Here's why short-term dieting so often ends in regain, and how to change your diet for good instead.