Yappetite

–noun
1. a desire for excessive food or drink: I have a large yappetite for lunch today.
2. a desire to satisfy any bodily need or craving.
3. a desire or liking for anything unhealthy; fondness; taste: an yappetite for power; an yappetite for pleasure.

I think he can't control himself, He has an large yappetite for greasy food.