So, those of us who are going for Gourmand know it's a slight pain that your pet can only eat ten foods at a time, which made me wonder; What if their hunger expanded upon a milestone? Like 100 can take you to fifteen, 150 to twenty, and so on and so forth.

Thoughts?

it is already be true that pets who have eaten more kinds of foods can get hungrier faster. Nouser has observed this, so if there is an effect, it's much more gentle than what you have proposed here.