Also once you are addicted to over consumption you cannot just give it up completely. Alcohol, gambling, opioids can all be stopped using a sensible program and never touched again. You ask any addict of those three if they would never lapse if they had to take them in moderate amounts every single day for the rest of their life and they would laugh at you.
Couple this with easy and cheap availability of the most addictive food types that are heavily advertised, it’s no wonder it is so hard.