noun
big eater; glutton
Refers to a person who eats a lot, often with a nuance of hearty appetite rather than purely negative gluttony.
彼は大食家で、ラーメンを三杯も食べた。
He's a big eater and ate three bowls of ramen.
Compound of 大 (big) + 食 (eat) + 家 (person). The exact historical derivation is uncertain, but the word is transparently formed from these elements.