He's a big eater.

他饭量大。

《新英汉大辞典》

He is a big eater.

他是个食量极大的人。

youdao

Dave is a big eater but he's met his match with Gordon-he eat like a horse.

戴维很能吃，他碰到了同样非常能吃的戈登。

youdao

I'd been diagnosed with low iron before, but the first surprised me, as I have always been a big leafy-green vegetable eater.

FORBES: Wave the White Towel

Asking too-big-to-fail banks to write resolution plans in the event of their failure is like giving an obese eater a free pass to neighborhood buffets and demanding that he draft a diet plan in case he dies.

FORBES: "Living Wills" For Banks Won't Kill Systemic Risk Or Greed