Public support for policies to improve population and planetary health:A population-based online experiment assessing impact of communicating evidence of multiple versus single benefits


BACKGROUND: Effective interventions for reducing the consumption of products that harm population and planetary health often lack public support, impeding implementation. Communicating evidence of policies' effectiveness can increase public support but there is uncertainty about the most effective ways of communicating this evidence. Some policies have multiple benefits such as both improving health and the environment. This study assesses whether communicating evidence of multiple versus single benefits of a policy increases its support. METHOD: Participants (n = 4616) nationally representative of the British population were randomised to one of 24 groups in an online experiment with a 4 × 3 × 2 between-subjects factorial design. The messages that participants viewed differed according to the evidence they communicated (no message, effectiveness for changing behaviour, effectiveness for changing behaviour + one policy benefit, effectiveness for changing behaviour + three policy benefits), type of policy (taxation, availability) and the target behaviour (consumption of energy-dense food, alcohol, or meat). The primary outcome was policy support. RESULTS: In a full factorial ANOVA, there was a significant main effect of communicating evidence of effectiveness on policy support, which was similar across policies and behaviours. Communicating three benefits increased support relative to communicating one benefit (d = 0.15; p = 0.01). Communicating one benefit increased support compared to providing evidence for changing behaviour alone (d = 0.13; p = 0.004) or no message (d = 0.11 p = 0.022). CONCLUSION: Communicating evidence of a policy's benefits increases support for policy action across different behaviours and policies. Presenting multiple benefits of policies enhances public support.

Publication DOI:
Divisions: College of Health & Life Sciences > School of Psychology
College of Health & Life Sciences > Aston Institute of Health & Neurodevelopment (AIHN)
Additional Information: © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license 4.0 Funding: Collaborative Award in Science from Wellcome Trust (Behaviour Change by Design: 206853/Z/17/Z) awarded to Theresa Marteau, Paul Fletcher, Gareth Hollands, Marcus Munafò.
Publication ISSN: 1873-5347
Last Modified: 20 May 2024 07:38
Date Deposited: 17 Mar 2022 13:25
Full Text Link:
Related URLs: https://www.sci ... 0296?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2022-03-01
Published Online Date: 2022-02-07
Accepted Date: 2022-01-12
Authors: Mantzari, Eleni
Reynolds, James P (ORCID Profile 0000-0003-1536-1557)
Jebb, Susan A
Hollands, Gareth J
Pilling, Mark A
Marteau, Theresa M



Version: Published Version

License: Creative Commons Attribution

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