I am sorry, that sounds dreadful. Always you have had hunger? Eating does not cause satiation? I also can feel empty without being hungry sometimes, it’s honestly a good feeling and best state to fall asleep.
Yes the tuned appetite should be universal.
In the interest of full disclosure - I did reach it coming out of anorexia so not overweight but underweight, but it has settled out to keep me at a healthy size as an adult. Except for a few very stressful years in my early 40s I lost some but bounced back. I think more people, at least in the US, are coming from the other side and I don’t have experience with that.