When people reduce their calorie intake, their total body weight changes similarly whether or not they do resistance training.
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Caloric restriction alone results in no significant difference in total body mass compared to caloric restriction combined with resistance training.
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When a person eats fewer calories, their body breaks down muscle for energy. But when they lift weights or do resistance exercises, the pulling force on muscles turns on a molecular signal that tells the body to build more muscle proteins. This stops the muscle loss that would otherwise happen with dieting alone.
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