Sadly, that's actually true.

There are two hormones that signal your brain around appetite: leptin, made by body fat, which says "all full, no more for me"; and ghrelin, made in the gut, which says "need food badly!"

But it seems some folks develop leptin resistance as they get fatter, until finally there's nothing between them and endless hunger signals. So a different vicious cycle begins...

And you end up with extremely fat people insisting that they're soooo hungry need food badly or else they're gonna die.