Does one partner being on a GLP-1 medication change household eating habits or grocery shopping?

Commonly reported, yes. Households often shift toward smaller portion cooking, different grocery choices (more protein-forward, less of what used to be regular staples), and sometimes the non-medicated partner adjusts their own eating somewhat just from the shared environment changing, even without intending to. References: https://obesitycanada.ca/healthcare-professionals/adult-clinical-practice-guideline/

Our grocery list looks pretty different now honestly, way less of our old go-to snacks around since they just don't get eaten. My husband's diet shifted too just from the house changing around him.