20岁之后，人很少继续长高，长高需要热量和营养物质——特别是蛋白质——以满足身体组织生长的需要。

Growth, which rarely continues beyond the age of 20, demands calories and nutrients—notably, protein—to feed expanding tissues.

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动物产品是生产效率不高的，并且会导致可用的热量和蛋白质的净亏损。

Animal products are inefficient to produce and result in a net loss of available calories and protein.

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这两个群体获得足够的蛋白质，碳水化合物，脂肪和热量，以保持自己的体重正常的食物。

Both groups got normal foods with enough protein, carbohydrates, fat and calories to maintain their weight.

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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

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