I've done the same (not underweight, but not overweight, and when you look around you and see nothing but hams and you aren't actively paying attention to your diet, you think "why not me too?") Surprise surprise, I am not an exception to the laws of thermodynamics.  I agree that the amount you WANT to shove down your gob every day, and the amount that feels good in your stomach, are matters of habit. Anybody can theoretically train themselves to overeat. Hence, I am the biggest non-Asian shitlord mama on the planet, because I hope to spare my children the struggle of adopting American eating habits and then having to retrain themselves to eat like humans.