|I'm not hungry anymore, but...this is so much fun to eat!|
At first glance, this thinking makes me nervous, because it sort of sounds like a diet-- "ignore your feelings of hunger now in exchange for a better, thinner tomorrow". The fundamental difference, however, is that you won't be depriving yourself, as you do when you're following a diet. Instead, you're stopping when you're biologically satisfied and no longer hungry, so you won't be dealing with the cascade of negative feelings and biological urges that arise from deprivation. Also (and this is super important!), you'll know that you can have that food, or whatever food strikes your fancy, any other time you want, so there's no reason to keep eating like it's your last meal, because there are many more fantastic eating experiences to come.
The liberation that comes with knowing that you're in tune with your body signals and can eat whatever food you want whenever you want it far outweighs the few moments of sadness you'll feel at having to stop. Try to think of that the next time you're faced with this dilemma. With time, as you prove to yourself that you're able to tolerate these sad feelings and make it through to the other side, your confidence will grow and it will only get easier.