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.

Hope springs eternal.