I wasn't obese, but overweight (10 to 15 kg above the baseline for my height), and i did had craving i thought i could not stop. A 3 day diet made me understand that the feeling of hunger is just that, a feeling, and some willpower was needed to ignore that.

Hormonal imbalance caused by overeating was in my case worst than the hormonal imbalance caused by lessening the amount of food i ingested, so it wasn't this hard to stop. Also my life improved a lot around that time (credit, job, appartment, relations), this might have helped too.

That is not established. I have never seen a study that says that obese people are hungrier than non-obese people. There isn't even a way to establish a baseline.

If I eat enough to sustain my obese body, I'm not hungry anymore. If I try to eat less, I'm hungry. I successfully lost 10kg, and first 5kg was even easy. I thought at start "ehh, that hunger is only a feeling, I can continue like that", but I couldn't and I'm back where I started. Just eating less may work for some people, but not everyone.

There are at least 3 hormonal ways, but such blood sampling is prohibitively expensive for now.

Of course it'd be better I'd you could just read it off neurons, too hard though.