Clinical trial NCT04340791: Increased Proportion of Lower Energy Density Items vs. Nutritional Labelling at an Online Supermarket
Official title: Effectiveness of Information-based Versus Structural Interventions on Food Choices by Socioeconomic Position: a Randomized Controlled Trial in an Experimental Online Supermarket
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Diet, Healthy
Food Selection
Keywords: availability
labelling
food choice
socio-economic position
Lead sponsor: University of Liverpool
Sponsor class: OTHER
First posted: 2020-04-10
Enrollment: 1000
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

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.

Eligibility criteria: 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)

Primary outcomes:
measure: Mean ED of the food items purchased (kcal/100g)
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
Secondary outcomes:
measure: Total energy of the food items purchased (kcal)
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
measure: Energy from total sugar (% of total energy)
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
measure: Energy from saturated fatty acids (SFA) (% of total energy)
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
measure: Salt content (g/100g)
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
measure: Proportion of lower energy density food items in the basket of foods purchased
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
measure: Cost (GPB)
timeFrame: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
Other outcomes:
measure: Validity
timeFrame: 5 minutes (the time frame denotes time taken to fill in the debriefing questionnaire and there is no follow up)
measure: Kcal influence
timeFrame: 5 minutes (the time frame denotes time taken to fill in the debriefing questionnaire and there is no follow up)
Locations:
city: Liverpool
country: United Kingdom
facility: University of Liverpool
state: Merseyside
Study officials:
References: