Yep, hunger is psychological and based on unconscious predictive analytics rather than current state.

Which is why eating slowly and preferring things that digest slowly is so immediately effective at reducing calorie intake (and thereby reducing weight). (As a bonus, it also reduces sugar high/crash minor mood swings.)

...wait, what?

.

I've noticed at least three kinds of being hungry. One is the "sugar crash" variety, one is the "oh, I forgot to eat this morning. That's what's wrong with me" kind, and one is the "not eating for a weekend actually kind of sucks and I am never doing this experiment again" type.

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(Also, I experimented with calorie counting for a while. Write everything down immediately in advance -- the same principle I discovered in order to avoid "wait, what did I do this week" for my timesheets at work -- and it works fine.)