noun, na-adjective, noun or participle which takes 'suru'
eating heavily; hearty eating; binge eating; gluttony
Refers to the act of eating a large amount, often in a single sitting. Can be used neutrally or with a negative connotation of overeating.
彼の大食いにはいつも驚かされる。
I'm always amazed by his heavy eating.
I ended up binge eating due to stress.
noun
big eater; trencherman; gormandizer
Refers to a person who habitually eats large quantities. 'Trencherman' and 'gormandizer' are rare or literary English equivalents.
彼女は小柄なのに大食いだ。
She's small but a big eater.
大食い選手権で優勝した。
He won the big eater championship.