GLP-1 meds are so effective, and likely will be cheap enough for most that I worry that there will be a "RTO" type push from companies to ban or discourage them due to the financial impact on food, snack, booze companies.
So its not out of the question that processed food and alcohol companies might lobby to restrict or ban these medications to protect their profits, despite them being proven to be medically effective.
It wouldn't be the first time corporate profit interests override the interests of ordinary people.
This doesn't mean that it won't happen, but it does make it especially vile if it does.
If people take GLP-1 meds and get down into the normal range, at that point even if they stay on the drugs, they're going to have to adjust the dose so they stop losing weight again (without gaining weight).
This means that even if everyone who's overweight or obese started taking GLP-1 drugs and started losing weight right now, the reduction in food consumption would still be limited and short term.
So I think this concern is somewhat overblown.