Price Promotions on Purchases of Snacks

Study Design: Randomised controlled trial Study Participants: Healthy volunteers from the UK Planned Sample Size: 500 Planned Study Period: June - December 2021 Objectives and Outcome Measures: 1. Primary * Objective: To investigate the effect of promotions on the total number of calories selected * Measure: Difference in the absolute energy (kcal) of the final basket between the two groups 2. Secondary Objectives: * To investigate the effect of promotions on the nutritional content of the items selected overall, and across the individual target food categories * To explore the impact of removing promotions by socioeconomic status Measures: * Difference in the absolute sugar (g, kcal, %E), salt (g), and saturated fat (g, kcal, %E) of the final basket between the two groups * Difference in the absolute energy (kcal), sugar (g, kcal, %E), salt (g), and saturated fat (g, kcal, %E) between the two groups across the individual target food categories * Analyses of the primary and secondary outcomes specified above by gender, age group, ethnic group (White vs Non-White), BMI stratified into \<30 and ≥30kg/m2 groups, education level (lower vs. higher), and household income (lower vs. higher) 3. Exploratory outcomes: * Objective: To investigate the acceptability of the intervention * Measures: Rating scores and open-ended answers from the follow-up questionnaire