Well it's a doozy but if you're looking for the worst part it's prolly the guilt. At least for me. When you do eat you feel guilty for it and when you don't eat you feel guilty about not eating. Like either way it feels awful. And then ofc there's the pressure from friends who know...just constantly "have you eaten" "go eat something" "this isn't ok" stuff like that...i get that they're trying to be nice and it's because they care but i hate it.
