Increased Proportion of Lower Energy Density Items vs. Nutritional Labelling at an Online Supermarket

Effectiveness of Information-based Versus Structural Interventions on Food Choices by Socioeconomic Position: a Randomized Controlled Trial in an Experimental Online Supermarket

This study will be a 2x2 randomised controlled trial with information-based intervention (no labelling / labelling) and structural intervention (default proportion / increased proportion of lower energy density food items) as between-subject factors and energy density (kcal/g) of food purchases during an online supermarket-shopping task as dependent variable. This study will use an online supermarket platform developed to mimic an online supermarket website and participants will be asked to complete a shopping task using a pre-determined shopping list of 10 items.

See attached protocol documents.

Inclusion Criteria:

• United Kingdom residents
• Aged ≥ 18 years
• Fluent in English
• Have access to a computer and Internet
• Responsible for a substantial proportion of household grocery shopping

Exclusion Criteria:

• Unable to provide informed consent and to comply with the study requirements
• Any dietary restriction (vegetarian, vegan, gluten-free, sugar-free, dairy or lactose free, food allergy, other)