From Longman Dictionary of Contemporary Englishbig/light/fussy etc eaterbig/light/fussy etc eaterEATsomeone who eats a lot, not much, only particular things etc I’ve never been a big eater. → eater
Examples from the Corpus
big/light/fussy etc eater• During the time she was living with the Abramses, Katelyn was happy and a big eater, Carter said.• While never a big eater, he did tend to snack it through the day and night. 