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A randomised experiment of health, cost and social norm message frames to encourage acceptance of swaps in a simulation online supermarket

Bunten, Amanda, Porter, Lucy, Sanders, Jet G., Sallis, Anna, Riches, Sarah Payne, van Schaik, Paul, González-Iraizoz, Marta, Chadborn, Tim and Forwood, Suzanna (2021) A randomised experiment of health, cost and social norm message frames to encourage acceptance of swaps in a simulation online supermarket. PLOS ONE, 16 (2). ISSN 1932-6203

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Identification Number: 10.1371/journal.pone.0246455

Abstract

Offering lower-energy food swaps to customers of online supermarkets could help to decrease energy (kcal) purchased and consumed. However, acceptance rates of such food swaps tend to be low. This study aimed to see whether framing lower-energy food swaps in terms of cost savings or social norms could improve likelihood of acceptance relative to framing swaps in terms of health benefits. Participants (n = 900) were asked to shop from a 12-item shopping list in a simulation online supermarket. When a target high-energy food was identified in the shopping basket at check-out, one or two lower-energy foods would be suggested as an alternative (a “swap”). Participants were randomised to only see messages emphasising health benefits (fewer calories), cost benefits (lower price) or social norms (others preferred this product). Data were analysed for 713 participants after exclusions. Participants were offered a mean of 3.17 swaps (SD = 1.50), and 12.91% of swaps were accepted (health = 14.31%, cost = 11.49%, social norms = 13.18%). Swap acceptance was not influenced by the specific swap frame used (all p > .170). Age was significantly and positively associated with swap acceptance (b = 0.02, SE = 0.00, p < .001), but was also associated with smaller decreases in energy change (b = 0.46, SE = .19, p = .014). Overall, offering swaps reduced both energy (kcal) per product (b = -9.69, SE = 4.07, p = .017) and energy (kcal) per shopping basket (t712 = 11.09, p < .001) from pre- to post-intervention. Offering lower-energy food swaps could be a successful strategy for reducing energy purchased by customers of online supermarkets. Future research should explore alternative solutions for increasing acceptance rates of such swaps.

Item Type: Article
Official URL: https://journals.plos.org/plosone/
Additional Information: © 2021 Public Health England
Divisions: Psychological and Behavioural Science
Subjects: H Social Sciences > HN Social history and conditions. Social problems. Social reform
B Philosophy. Psychology. Religion > BF Psychology
Date Deposited: 04 Mar 2021 16:45
Last Modified: 20 Apr 2021 01:28
URI: http://eprints.lse.ac.uk/id/eprint/108955

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