This is less of a problem in modern life then it used to be, but because things are supplemented and fortified-- overly so in some cases-- but still the deficiencies are less common then they used to be.

相比过去,这在现代社会中已不太多见,因为如今很多食物有人工添加的微量元素,有些甚至是过度添加了,但相比过去,缺乏微量元素已不那么常见了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

There can be a supply of them, a storehouse of them that can build up in the body, and so day-to-day fluctuations become less of a problem with fat soluble then water soluble vitamins, because the body can go grab them from a storage depot, if you will.

从而在体内建立起一个供应源,一个脂溶性维生素仓库,这样一来,相比起水溶性维生素,脂溶性维生素的浓度不会每天剧烈波动,因为机体可以任意取用体内的储存

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选