减少的肌肉也会降低你的身体消耗热量的速率，这令你保持健康的体重或者减去多余的脂肪变得更具挑战性。

Less muscle mass also decreases the rate at which your body USES calories, which can make it more challenging to maintain a healthy weight or lose excess pounds.

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这种情况发生在他们吸收的能量多余消耗的能量时，未消耗的能量就以脂肪的形式被储存下来。

That occurs when they take in more energy than they expend. The unused energy is stored as fat.

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究竟锻炼能不能将脂肪转化成肌肉？难道肌肉也不能比脂肪更有效率地消耗多余的热量吗？

After all, doesn't exercise turn fat to muscle, and doesn't muscle process excess calories more efficiently than fat does?

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