Harvard Health Letter

Ask the doctor: How you burn calories matters when you're trying to lose weight

Exercising more and eating less can help people lose weight. However, it’s not just a matter of willpower. Not everyone digests food with the same amount of efficiency. And not everyone burns calories with the same efficiency, possibly because of genetics, hormones, or types of fat. So some people have great trouble losing weight even when they exercise more and eat less, and other people never seem to gain weight despite eating a lot of food.
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