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

Not Applicable

Completed

• Conditions: Diet, Healthy; Food Selection

• Registration Number: NCT04340791
• Lead Sponsor: University of Liverpool

Brief Summary

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.

Detailed Description

See attached protocol documents.

Study Timeline

• Study First Submitted: 2020-04-07
• Study First Submitted QC: 2020-04-07
• Study First Posted: 2020-04-10
• Study Start: 2020-04-13
• Primary Completion: 2020-04-13
• Study Completion: 2020-05-13
• Status Verified: 2020-11
• Last Update Submitted: 2020-11-02
• Last Update Posted: 2020-11-03

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 1000

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)

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Mean ED of the food items purchased (kcal/100g)	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Calculated as the sum of the energy of the purchased items (kcal) divided by the sum of their weight (g) and multiplied by 100.

Secondary Outcome Measures

Name	Time	Method
Energy from total sugar (% of total energy)	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Calculated as the percentage of total energy of the purchased items from total sugar
Total energy of the food items purchased (kcal)	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Calculated as the sum of the energy of the purchased items (kcal)
Energy from saturated fatty acids (SFA) (% of total energy)	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Calculated as the percentage of total energy of the purchased items from SFA
Salt content (g/100g)	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Calculated as the sum of the salt content of the purchased items (g) divided by the sum of their weight (g) and multiplied by 100.
Proportion of lower energy density food items in the basket of foods purchased	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Lower energy density items will be defined as ≤ median of energy density distribution within a food category
Cost (GPB)	20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)	Calculated as the sum of the prices of the purchased items

Trial Locations

Locations (1)

University of Liverpool; 🇬🇧 Liverpool, Merseyside, United Kingdom