Glucose has to get into cells, that's the main source of energy source that cells use, metabolism of glucose.

但葡萄糖又必须进入细胞,因为它是细胞能量的主要来源,即通过葡萄糖代谢产生能量

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So fat becomes a very valuable energy source.

所以脂肪是非常有价值的能量来源

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Because muscle can use and frequently is using glucose as a source of energy.

因为肌肉细胞可以利用糖分,通常将糖作为能量来源

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