It's not just GLP-1 type drugs.
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.
This comment is more insightful than it may appear initially. It looks like the 5% drop is in comparison to the pre-Ozempic spending. To what extent is the cut on spending monetary i.e. "I am spending more on this drug and will cut back my other expenses." Sure, Ozempic will kill the cravings, and that is probably the main driver, but from a 5000 foot view, this is using money to buy drugs instead of foods. In a very abstract way, it's the same as buying amphetamines to lose weight, just with a different (arguably smaller) set of side effects.
Also, I can't find the comparison in the study to spending by non-Ozempic households. Is it possible that they decreased their spending during the time frame too, for other economic reasons? All this to say is that I think the story is more complex than the headline indicates.
This happened when I started Adderall, but eventually appetite came back after a few years.
Both those drugs are also known to suppress appetite in many people - to the point that some used them solely as appetite suppressants.
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)