氨基酸是构成蛋白质的化合物，人体需要它们来帮助分解食物，让组织生长，以及修复组织。

Amino acids are organic compounds that form protein. The body needs them to help break down food, and to grow, and repair tissue.

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

单位重量中脂肪的热量含量,是蛋白质和碳水化合物的两倍,因此,脂肪才是最能维持生存的物质

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

What about sources of protein, that and carbohydrate for you, and how do those look and where are you getting those from?

那蛋白质的来源呢,还有碳水化合物,这些都长什么样,你从何摄入这些元素

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

As I mentioned before, fat has twice the calories per unit weight as protein and carbohydrate.

如我之前所说,单位重量中脂肪的热量含量,是蛋白质和碳水化合物的两倍

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选