Can supermarkets coax people into buying healthier meals?

Journal References:

  1. Carmen Piernas, Georgina Harmer, Susan A. Jebb. Removing seasonal confectionery from prominent store locations and purchasing behaviour within a major UK supermarket: Evaluation of a nonrandomised controlled intervention study. PLOS Medicine, 2022; 19 (3): e1003951 DOI: 10.1371/journal.pmed.1003951
  2. Carmen Piernas, Georgina Harmer, Susan A. Jebb. Testing availability, positioning, promotions, and signage of healthier food options and purchasing behaviour within major UK supermarkets: Evaluation of 6 nonrandomised controlled intervention studies. PLOS Medicine, 2022; 19 (3): e1003952 DOI: 10.1371/journal.pmed.1003952

Dietary targets for saturated fat, dietary fiber, sugar, and salt intake are currently not being met in the UK. Poor diets are an important risk factor for chronic diseases, and many socioeconomic inequalities remain when it comes to diet. Evidence from systematic reviews has suggested that grocery store interventions may be effective at changing diet, but evidence in real supermarkets has been lacking.

In the first new study, the researchers evaluated six interventions involving the availability, placement, promotions, and signage of healthier products within three major chains of UK grocery stores. They found that increasing the availability of healthier options within a category was associated with significant changes in purchasing. For instance, stocking low-fat chips next to regular chips decreased the sales of regular chips (-23% in intervention stores vs. -4% in control stores, p=0.001). Stocking more lower calorie biscuits increased sales by 18% and decreased purchases of regular, higher calorie biscuits by 4%.

In the second study, Piernas and colleagues evaluated a grocery store intervention to remove seasonal chocolates and candy from prominent locations within a major UK supermarket in the 7 weeks leading up to Easter. In 34 intervention stores, free-standing promotional displays of seasonal chocolate confectionery products were removed, although the candies were available elsewhere in the store. The researchers found an attenuation in the usual seasonal increase in confectionery sales; units of confectionery sales increased by 18% in the control stores during the pre-Easter period but only 5% in the intervention stores (p

Together, the papers offer new evidence on how legislation can help shape consumers’ diets with the goal of improving health. “This research has important implications for the development of policies by retailers or governments to bring dietary intakes closer to recommendations for good health,” the authors write. “Strategies aiming at informing customers about healthier options are unlikely to work in isolation.”

Regarding the first study, Piernas adds, “The Government in England has announced new legislation to restrict promotions of foods high in sugars, salt and saturated fat (HFSS) in prominent locations. This project established a partnership with a large UK food retailer to evaluate an intervention to remove seasonal chocolate confectionery from prominent areas of the store, specifically end-of-aisles and entrance areas, over 7 weeks before the Easter period. These results from a ‘real world’ intervention provide promising evidence that the proposed legislation in England to restrict promotions of less healthy items in prominent locations may help reduce over-consumption.”

Regarding the second study, Piernas adds, “In this multi-retailer partnership, we conducted an independent evaluation of six in-store interventions within three major UK food retailers aimed at improving food purchasing behaviours. We reported that some choice architecture interventions implemented within stores, such as availability and promotions, were associated with short-term changes in food purchasing behaviours. However, the effect of promotions on consumer behaviour may diminish with time and are less likely to be sustainable for retailers over longer time periods.”

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Can supermarkets coax people into buying healthier meals?

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