Greetings,
Some of us just love food !!
Perhaps you could share with your son a couple of hints I've found helpful--
his hunger may come from some nutritional lack, so he keeps seeking more food in order to try to get enough of that missing vitamin, mineral, whatever. So if he'd start his day with some good quality nutritional supplements--calcium, protein tablets, vitamin E, etc, he might not get cravings later.
I'm coming back down from being overweight myself. I expanded the variety of tastes in my pantry and try exploring new foods as often as possible. I find enjoying more has led to needing less.
Perhaps these individuals are in your life so that they will be reminded of the damage they do, even though they can't help doing it. Maybe they are balancing out a previous life when such food was not available and they need to satisfy themselves that they won't starve. (In the life I've come to believe I lived previously, I died of starvation.
)
Ultimately their choices are their own. Can you find a way to offer your son reminders that doesn't punish you or him? Like pre-printed little notes saying 'Because I care.' or some such?
Spirit and pragmatics really come together at the dinner table, eh !?
Bets