If you eat 25% fewer calories than you burn every day, and you do this for a week, unless our physiology is dramatically different, you will feel hunger that is not related to habit.

Interestingly, for me? If I cut down to the point where my performance falls (closer to 40% for a few days) my hunger kind of goes away. Of course, I can't really work in that state (I'm aware some others can) so it's not really useful to me. If I want to lose weight while still working, it seems I need to experience that hunger.

One of the annoying things for me is that because this hunger is such a big part of my experience, I want to talk about it, and this... annoys almost everyone. Aside from people on the internet who want to insult you for not following their favorite fad diet, it's worse in person, because almost everyone I've talked to about it in person seems to think I'm telling them that they need to lose weight.