alt Hacker NewsAnd that's where the GLP-1 meds come in. You get physically sick from eating your current (oversized) meal size. You don't have cravings. You can lose weight using GLP-1 even if you don't exercise strenuously/daily. However you lost a lot more if you have a regimen.
If his weight is stable then his meal size is probably in the norm. That's the hard part of losing weight. Only a small sustained calorie excess will make you gain weight but you need a large sustain calorie deficit to lose it. And your brain and body will fight as hell against this.