That fits with my current understanding. Your body's hunger response (driven in part by hormones) is complicated, and for lack of a better word it can be "habit

That fits with my current understanding. Your body's hunger response (driven in part by hormones) is complicated, and for lack of a better word it can be "habituated" to a routine. But I believe there are still very real mechanisms (like said hormones) rather than being a psychological construct. I would be willing to bet if you had blood samples, you would see very real distinctions in blood markers associated with hunger as your response changed.