What does "want to eat more" mean to you?
I distinguish between "stomach hunger" and "mouth hunger". In other words, hunger and craving. If my stomach hurts, I'm hiccoughing or burping, and I'm feeling mentally jangly and irritable then I'm hungry. If I can really really taste how good that thing would be in my mouth right now, then I'm craving.
The weird thing is that they are spatially distinct. One feeling is in my mouth and one is in my gut.
EDIT> Do you think that if food were not as abundant, if it was kind of taboo to waste your money by going out and buying pre-made food, and if the people around you were not modeling over-eating that your body would still want more than it needed? Could there be a training effect?