Comment by mft_

> Skinny people don’t even feel hunger.

I suspect it’s a touch more complex than that. :)

Anecdata: I have a 40-something friend who enjoys eating lots more than I do (and I witness this repeatedly: round after round of bread and chunks of cheese after a full meal, always happy to have desserts that I’ll sometimes forgo, etc.) and who stays slim. Sure, he exercises, but not so much more than I do to account for the calorie delta between us.

He’s just made differently, in a way we can’t currently explain. We sometimes joke about a faecal transplant.