My grocery spending has fallen significantly since I started ADHD medication. Both lisdexamfetamine and methylphenidate absolutely zeroed my appetite. When I walk around a grocery store I'm no longer tempted by anything I didn't actively go in to buy. This is a huge shift from my pre-medication days.
They also do have significant risk of side effects (not trying to say anything about their used for ADHD which is well proven). Probably not a great idea to be prescribing tons of stimulants to people who don't need them (especially because these are drugs which are in large shortage often)