I suspect something like that is going on. It is pretty clear to me that there is a strong genetic component. We know the hunger system is very complicated. It's the reason we still don't have a weight loss pill. If you decrease hunger along one channel, the other channels ramp up to compensate.
But there also may be other components that we can do something about. For example, perhaps the bacteria in my gut are causing half of my hunger, insisting that I eat bread (because they want it, not I). And if I starve them out on a zero carb diet, I can break free of the excess hunger.
I don't think it's just genetics, or genetics are rapidly changing in the last 100 years.
Personally I think it's some combination of gut biome, all than not messed up childhood eating habits (I've been taught to eat till stuffed, not so great in combination with my next point) , and way too calorie heavy (processed) food (it's not a challenge to find food where a quarter package is a healthy amount, way more challenging to find food where they food for a full package) not too mention it's made to keep you eating (so more is sold, sigh) . I'm always surprised people claiming not to have cravings whatever (even when the stuff is put in front of them), or be satiated by eating what for me is half a meal (even when I maintained a normal weight) .
Regardless eat less and try harder are hard to keep up, for me personally protein doesn't help to satiate me either. Part of it is that (for me) it's much easier to get into a habit to eat too much than to keep up the habit of eating just enough (I dare say 2+ years of keeping it low is a habit, but now for 3 wars annually 5kg was added: next try keto, hope it works as well as advertised)
But there also may be other components that we can do something about. For example, perhaps the bacteria in my gut are causing half of my hunger, insisting that I eat bread (because they want it, not I). And if I starve them out on a zero carb diet, I can break free of the excess hunger.
Hope springs eternal.