E.g., if I avoid eating refined carbs (sugar, white flour, etc) for a month or so, suddenly hunger is this mild, easily tolerable sensation. I just end up eating less. If I go back on them for a while, hunger returns to being MUST EAT NOW.
I used to hear people talk about forgetting to eat, and I would always think, "How is that even possible?" But now I know: we might use the same word, but the experience can be very different.