Humans can live 3 weeks without eating.
Let's say hypothetically there were no negative health effects from fasting that long.
I offer you $100,000 to not eat that long.
There's food in the house. There's a grocery store down the street.
After 1 day of not eating you'll be really hungry.
After 2 full days of no food you'll be famished.
By day 5 you'll be absolutely starving. You'd begin hallucinating about food. Dreaming about. It would occupy every thought. Think that's in your control?
By day 10 it will be absolutely impossible for you to not eat. I could raise my offer to a million, and you will break down and eat what's around you or go get something.
By day 12 you'd eat your pets. You'd kill them with your bare hands and eat them raw.
What do you call that drive to eat? Is that a "decision" you'd make to eat? A failure of willpower or morality? Or an increasingly powerful biological drive that will ultimately override your willpower, even a knuckle dragging god like creature like you.
What if something in that biological mechanism was broken and the same drive that exists at day 7 of your fast exists all the time for someone? Like people who get hiccups lasting days, or a nerve issue that causes a perpetual itch?
You're just too willfully stupid to believe, or even have the intellectual curiosity to understand the science,
Can you even eat 8000 calories a day? I bet you can't. Yet they can. If you had two brain cells you'd find that odd and ask why that might be.
If they're eating out of gluttony and selfishness, why do these drugs that raise glucagon levels and reduce appetite successfully result in weight loss for nearly 100% of people? Aren't they eating for pleasure and not out of appetite?