You eat like a bird...

你吃的饭量和小鸟差不多（就是吃的很少的意思）

You eat like a bird, no wonder you can keep youself so slim.
你吃的这么少，难怪你可以保持那么好的身材。

You eat like a bird in the cage.

You eat like a bird which flies high in the sky.

You eat like a bird. I wonder if you have had enough.

You eat like a bird so you look so slim.

你吃的好少啊

you eat like a horse 你好能吃啊

you drink like a fish.