How does muscle mass affect metabolic rate and weight gain?

People forget how valuable muscle mass is to quality of life, longevity, and the ability to maximize energy. Certainly genetics and special conditions, such as thyroid issues, can come into play, but the overriding factor in both weight gain and metabolic rate is muscle mass. Unlike fat, muscle is a high-maintenance tissue.

It's in constant use by the body, and as such it requires a lot of energy to keep it in good working order. This helps explain why lean, more muscular people have an easier time burning calories at rest than do people with higher proportions of body fat. Muscle burns calories, whereas fat just stores them.

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