你应该减少摄入脂肪和碳水化合物。

You should cut down on fats and carbohydrates.

《牛津词典》

脂肪单位体重的卡路里含量是蛋白质和碳水化合物的两倍，因此，有最能维持生存的价值。

Fat has twice the calories per unit weight than protein or carbohydrate sugar has, as a consequence, has the greatest survival value.

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实际上，我们摄入的大部分卡路里主要来自小麦和大麦，它们富含碳水化合物但却缺少蛋白质。

In fact, most calories come from wheat and barley, which are full of carbohydrates but have little protein.

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