A glutton; someone who loves to eat — an informal, often affectionate term for a person who eats a lot or enjoys food.
彼は大の食いしん坊で、どんな料理でもよく食べる。
He's a real glutton and eats just about any kind of food.
あの子は食いしん坊だから、おやつを隠しておいたほうがいいよ。
That kid is a foodie, so you'd better hide the snacks.
『食いしん坊万歳！』と彼はニコニコして言った。
He smiled and said, 'Long live the food lovers!'