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Randomized Controlled Trial
. 2023 Apr 6;13(4):e065620.
doi: 10.1136/bmjopen-2022-065620.

Effects of front-of-package nutrition labelling systems on understanding and purchase intention in Jamaica: results from a multiarm randomised controlled trial

Vanessa White-Barrow  1 , Fabio S Gomes  2 , Sheerin Eyre  1 , Gaston Ares  3   4 , Audrey Morris  5 , Deonne Caines  6 , David Finlay  1
Affiliations
Randomized Controlled Trial

Effects of front-of-package nutrition labelling systems on understanding and purchase intention in Jamaica: results from a multiarm randomised controlled trial

Vanessa White-Barrow et al. BMJ Open. .

Abstract

Objective: To assess the effects of three different front-of-package labelling (FOPL) schemes on objective understanding and intention to purchase of products, in Jamaica.

Setting: Supermarkets in Jamaica.

Participants: Adult supermarket shoppers in Jamaica (n=1206) aged 18 years old or older were included in the study, except for those visually impaired, or unable to give informed consent.

Design: Multiarm parallel-group randomised trial.

Interventions: Participants were randomly allocated to one of the three intervention groups or the control group. They were exposed to two-dimensional images of 12 mock-up products presented in random and balanced order. Participants assigned to the intervention groups were exposed to one FOPL scheme: black octagonal warning labels (OWL), magnifying glass high-in single icon (MGG) or traffic-light labelling (TFL). The control group was exposed to the nutrition facts up front.

Outcome measures: OR for correctly understanding nutritional information (correctly selecting the least harmful option, correctly identifying sugars, sodium and/or saturated fats found to be in excess) and choosing to purchase the least harmful option (purchase intention), more often.

Results: Compared with the control group, the odds for correctly selecting the least harmful option more often were 107% higher in the OWL group (OR 2.07, 95% CI 1.54 to 2.78; p<0.001), whereas the MGG (1.18, 95% CI 0.89 to 1.57; p=0.24) and the TFL (1.13, 95% CI 0.85 to 1.51; p=0.39) were inefficacious in improving such odds. OWL also resulted in the highest odds for correctly identifying a product with excessive amounts of sugars, sodium and/or saturated fats and for deciding to purchase the least harmful option or none of the options.

Conclusions: Octagonal warning labels performed best at improving the ability of adult shoppers in Jamaica to understand the nutrition information and at encouraging them to purchase the least harmful option more often.

Keywords: health policy; nutrition & dietetics; public health.

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Conflict of interest statement

Competing interests: All authors have completed the ICMJE uniform disclosure form at www.icmje.org/coi_disclosure.pdf and declared no financial relationships with any organisations that might have an interest in the submitted work and no other relationships or activities that could appear to have influenced the submitted work.

Figures

Figure 1
Figure 1
Example of images of one category of products shown to participants assigned to one of the front-of-package labelling groups (traffic-light labelling). Images developed by coauthors, Carlos Felipe Urquizar Rojas and Carla Galvão Spinillo, and designed by Carlos Felipe Urquizar Rojas and Carla Galvão Spinillo.
Figure 2
Figure 2
Example of a product from each of the FOPL groups. (A) Nutrition facts up front (control condition); (B) single icon high in FOPL with magnifying glass; (C) traffic-light labelling scheme; (D) octagonal warning label. Images developed by coauthors, Carlos Felipe Urquizar Rojas and Carla Galvão Spinillo, and designed by Carlos Felipe Urquizar Rojas and Carla Galvão Spinillo. FOPL, front-of-package labelling.
See this image and copyright information in PMC

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