It's not the best form of food in that they're actually very poor in protein, and unfortunately very, very rich in cyanide.

但木薯的根并不是最好的食物,因为它的蛋白质含量很少，而更不幸的是，它的氰化物含量非常，非常高。

麻省理工公开课 - 化学原理课程节选

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

Protein was a lot different in this period of time and many health authorities think a higher protein diet would benefit humans.

蛋白质的含量也不同,现代很多健康专家认为,高蛋白质的摄入是对人们有益的

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