We all know people who seem to be able to eat as many food calories as they like without gaining weight. However, clinical studies show that although a higher metabolic rate does allow people to eat more without gaining weight, slender people typically inherit a lower metabolic rate than obese people, and thus burn fewer calories while at rest. According to the latest theory, leaner people are believed to be more “spontaneously active” than obese individuals and have greater “non-exercise activity thermogenesis”. In simple terms, they twitch, or move around, or fidget more than overweight people, and this helps to burn extra calories.

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