Now, moving on to the micronutrients,

再说说微量元素
the vitamins, minerals and water; these become pretty interesting.

维生素矿物质和水这很有趣
They appear in food in pretty small amounts

它们在食物中所占比重很小
which is why they're the micronutrients;,

这也是称它们为"微量元素"的原因
but they're vital for health,

但它们对健康的意义却是至关重要的
so if you're deficient in micronutrients you've got big problems.

如果缺乏微量元素的话会很糟糕
This is less of a problem in modern life then it used to be,

相比过去这在现代社会中已不太多见
but because things are supplemented and fortified--

因为如今很多食物有人工添加的微量元素
overly so in some cases--

有些甚至是过度添加了
but still the deficiencies are less common

但相比过去
then they used to be.

缺乏微量元素已不那么常见了
These are things that must be taken in from the environment

这些都是必须从外界摄取的物质