I know it sounds like common sense, but I think a lot of us grew up with parents that made us finish our food even if we weren’t hungry. So eating more than we needed was normalized, and it became difficult to just stop mid meal.
Growing up with not much also conditioned you to eat everything on the off chance you can get a full meal. This has been a point of contention with my SO several times. They came from a well off family and they have no problem not finishing their food or not using some ingredients in the fridge whereas I’ve been conditioned to finish all meals no matter what and to be able to use up everything (not letting stuff expire) stored in the fridge.
Yeah, seems obvious but when your entire childhood is filled with shame because “there are starving kids in Africa so finish your plate”, it’s not so simple. Or when you realize that eating is the basically the only joy you have in life, it’s not so simple. Or when you have to take medications for your mental health and the side effects are that you over eat, it’s not so simple. Or when you have no time to exercise bc both you and your wife have to work to afford anything in this stupid economy, it’s not so simple.
Literally genetics, some people produce more ghrelin than others, and it happens within every racial and ethnic group so people can’t be CHUDs about it