New retail data confirms what many category managers have suspected: the rapid rise of GLP-1 weight loss medications is no longer a niche health trend, but a structural shift in UK grocery demand that is already reshaping how shelves, ranges and promotions need to be planned.According to research from retail data firm Worldpanel by Numerator, the proportion of British households with at least one GLP-1 user has nearly tripled in two years, rising from 2.3% in 2024 to 4.1% in 2025 and 6.3% in 2026. Households with a user now spend, on average, £418 less per year on groceries than non-user households, a combined market-wide impact estimated at £780 million.
Crucially, this is no longer purely a medical phenomenon. Over a quarter of respondents said they would use a GLP-1 medication to lose weight even without a major health condition, and 68% of current users say weight loss, not diabetes management, is now their primary reason for taking the drugs. For category managers, this signals a durable shift in the shopper base rather than a temporary dip driven by a small clinical population.
“The Worldpanel research shows where baskets are already changing,” says Patrick Finlay, Managing Director of The Category Management Company.
Crisps and confectionery are the categories most impacted, as reduced appetite and snacking urges cut into impulse and indulgence purchases, and oral health products are seeing a lift, driven by side effects such as bad breath associated with the medication. Over half of users now describe their eating style as “mindful,” led by hunger cues rather than habit or routine, undermining the routine-driven repeat purchase patterns that many categories are built around.”
Shopper expectations are moving just as fast as behaviour. Two-fifths of GLP-1 users say they want smaller portion sizes, and over a quarter want dedicated “GLP-1 friendly” sections in menus and, by extension, on shelf.
This, says Finlay, has implications for brand owners and retailer category teams:
“Demand for smaller, more controlled portions is a merchandising signal, not just a product development one. Range reviews should test smaller formats and single-serve options across snacking, confectionery and ready meals, rather than treating “downsizing” purely as a cost-of-living response.
With crisps and chocolate confirmed as the hardest-hit categories, decisions may need to be taken to rebalance space toward protein-forward, “better-for-you” alternatives, without abandoning indulgence entirely. Usage occasions are shifting, not disappearing.”
The oral care uplift, Finlay continues, is a reminder that GLP-1’s ripple effects extend well beyond food and drink aisles. Category teams in health and beauty should be reviewing whether adjacencies, cross-merchandising and promotional bundling can capture this emerging occasion.
“With over three-quarters of current users being women, and a growing share taking the drugs for lifestyle rather than clinical reasons, category managers need sharper shopper segmentation that reflects motivation, for example, health condition vs. lifestyle choice, rather than purely demographics.
The clear shopper demand for GLP-1-friendly labelling and menu sections suggests an on-shelf and in-store communication opportunity, helping this growing shopper group navigate ranges quickly, in the same way “free-from” or “high protein” signposting has developed in recent years,” he says.
The British Retail Consortium says supermarkets are already moving to respond. Andrew Opie, the BRC’s director of food & sustainability, said retailers “have invested heavily in healthier products, along with specific product lines to support those on GLP-1,” adding that competitive pressure between retailers means new products are being brought to market quickly as consumption trends shift.
Worldpanel’s own analysts note the picture is complex: while 72% of people believe GLP-1 adoption is running ahead of a full understanding of its long-term effects, uptake, particularly as US trends filter through, shows no sign of slowing.
“This is not a passing trend to wait out,” concludes Finlay. “Categories are changing rapidly, meaning suppliers need to either refresh their category strategies or get ahead of the curve to anticipate and plan for future trends. With household penetration nearly tripling in two years and no sign of a plateau, category managers who treat GLP-1-driven behaviour change as a core planning requirement on pack size, space allocation, adjacency strategy and shopper communication, will be best placed to protect basket value as the “small appetites” economy continues to grow.”
