During the post-feeding session, when I didn't feed anything to anyone, I still see the characters saying that they are full when they didn't eat anything at all. I think you should add an interaction where they complain about being hungry if you don't feed them enough.
Also, every food makes them say "Ugh... that was alot..." when it is in fact, very little (I feed them a snack when their stomach is empty).
Why didn't I feed anything? I want to stockpile the meal-points and see if what I purchased still persists after the session.