Unless the title was changed, it says "average" which to me pretty clearly means it's measuring individual or household consumption

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a123b456c 3 hours ago | parent [-]

The question is what average; some people apparently view "in the US" as implying US population-level averages (which it does not explicitly imply), whereas authors report the average within adopting households, which for this study's data source, all happen to be in the US

	▲	HDThoreaun 2 hours ago \| parent [-]
		If the claim was just that grocery spending is down 5.3% across the country they wouldnt have said average, the title would just be "Ozempic reduced grocery spending by 5.3% in the US"