Your stomach stretches out after a long enough time of eating like this and you have to eat even more to feel full.

Watch some “my 600lb life” and it starts to make sense. It’s a slow boil, to be sure, but I think it can happen to anyone that isn’t paying attention, who uses food and that feeling of fullness to cope with whatever negative feelings they have. I like Sean of steel (former 600lber), he gives some really good context in his react vids on youtube.