It has a lot more energy density than batteries,".

VOA: standard.2009.09.02

So the fact is those lab animals have a hard-wired preference for foods that are high in fat and high in sugar, primarily because of the energy density that those foods bring to one, and then the variety is important because you get a mix of nutrients.

事实上 实验动物对高脂肪高糖的食物,有着强烈的偏爱,而这种爱基于,该类食物能给我们提供高能量,多样性很重要,因为你能摄取多种营养

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选