and that really corrected a lot of those deficiency problems around the world.

使得全球诸多碘缺乏问题得到了改善
And so there are good things you can do with nutrients

这些是在食物中添加微量元素
by fortifying foods with them.

所能得到的益处
But of course, there can be abuse of these when the food industry

但是当食品工业在食物中加入了
puts stuff in foods it doesn't really need to be there,

原本并不需要的成分
and then they overstate the value of them and we'll talk about that,

并夸大其作用时自然也会反受其害
what's reasonable and what's not

随着课程的深入
as we go through the class.

我们会探讨其中哪些合理哪些不合理
Water, of course, is very important.

水当然也是非常重要的
Our relationship with water has changed a lot too

我们和水的关系也改变了很多
and a lot of that is due to marketing.

这都是拜市场化所赐
It used to be the case that--

以前的情况是