Iron is a vital nutrient, but too much iron can be harmful.

VOA: standard.2010.08.05

And then, you can look at the nutrient broken down as a function of the percent daily values.

下面是各种营养成分的含量,及其所占每日建议摄取量的百分比

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And so the food is a broader constituent of what we consume; the nutrient will be the pieces of the food that affect bodily function.

所以食物的概念要比吃的东西更加广泛,食物中的营养素影响着我们的人体机能

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

According to Ben Urbonas, president of the Urban Watersheds Research Institute, these nutrient contaminants tend to be more of a problem in closed water systems,like lakes, where concentrations can build up.

VOA: standard.2010.08.04

And if food is anything you eat, it gives you a nutrient, then basically everything satisfies the criteria for food; not everything in the world, but most things would.

若不论吃什么,只要提供营养就是食物,那基本上没有什么不满足食物的定义,倒不是说一切东西,至少绝大部分都满足

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

A nutrient is considered a substance within the food, that's when it digests it, absorbs, promotes some bodily function, so that it has some metabolic health value when people consume it.

营养素是包含在食物中的物质,由人体消化,吸收,推动身体机能,食品必须具有值得人类去代谢的健康价值

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Focusing on one nutrient is a losing proposition, according to some people, but there are others who say that, nope some nutrients prevail over others and are highly important compared to other things that you might be concerned with.

对一些人而言,只关注一种营养的多寡,就像是一宗亏本买卖,是一叶障目的,但还有其他人说,不对,某些营养比其他营养更关键,而且相比其他,营养更应成为需重点考虑的部分

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选