One word that is often used to describe very thin people that shouldn't really be used is anorexic.

有一个词常被用来描述极瘦之人，但实际上却不该用，这个词是厌食的。

Instead, it's the thin people with big appetites that we should be wary of.

相反，我们应该警惕胃口大的瘦人。

But there are good weeks and bad weeks for thin people, too.

可是对于瘦人来说 每一周同样有好有坏。

There's no clear link between thinner people and fast metabolism, and the same goes for larger people and slow metabolism.

瘦人和新陈代谢快之间没有明确的联系，大个子和新陈代谢慢也是如此。