This progressive loss of muscle mass is responsible for what many call the slowing of the metabolism with age. Muscles are a major source of energy consumption, so the calories in/out equation becomes imbalanced when muscle mass decreases if the same amount of calories are consumed. Loss of muscle mass is also associated with insulin resistance, a condition where the body doesn’t respond appropriately to insulin. This causes the body to produce more insulin to compensate, increasing hunger and also leading to weight gain. The combination of insulin resistance and weight gain due to loss of
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