Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.

Eating Behaviour Clinical Trial

Official title:

Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02618174
• Other study ID #: UBirmingham-SNS1
• Status: Completed
• Phase: N/A
• First received: November 24, 2015
• Last updated: November 27, 2015
• Start date: October 2013
• Est. completion date: July 2014

Study information

• Verified date: November 2015
• Source: University of Birmingham
• Contact: n/a
• Is FDA regulated: No
• Health authority: United Kingdom: Research Councils UK
• Study type: Interventional

Clinical Trial Summary

Encouraging individuals to eat vegetables is difficult. However, recent evidence suggests that using social-based information might help. For instance, it has been shown that if people think that others are eating lots of fruit and vegetables, that they will consume more of these foods to match the 'norm'. The purpose of this study was to determine whether a liking social norm (information about how much others like vegetables) would be effective at encouraging people to eat more vegetables and to examine whether these effects are sustained beyond initial exposure (i.e. whether the effect of the norm persists on food selection 24 hours alter).

Description:

Using a 2 x 5 x 2 experimental design we investigated the effects of exposure to various messages on later food intake and whether any effects were sustained 24 hours after exposure in both low and high consumers of vegetables. There were three factors of delay (immediate food selection versus food selection 24 hours after exposure), message type (liking norm, descriptive norm, health message, food-based control, and neutral control message) and habitual consumption (low versus high). The buffet consisted of three raw vegetables, three energy-dense foods and two dips.

In this study the investigators hypothesised that a liking norm would increase the consumption of vegetables (compared to a neutral control condition) and that the effect would persist on vegetable consumption 24 hours after intital exposure to the liking norm.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 400
• Est. completion date: July 2014
• Est. primary completion date: July 2014
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 18 Years to 65 Years

Eligibility

Inclusion Criteria:

• Healthy volunteers

• Sufficiently fluent in English

Exclusion Criteria:

• Smokers

• Diabetes

• Food allergies

• Past / present depression or anxiety

• Past / present eating disorder.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject)

Related Conditions & MeSH terms

• Eating Behaviour

Intervention

Behavioral:
• Neutral Control Condition
Message about age of University of Birmingham
• Food-based Control Condition
Message about variety of vegetables in the world
• Health Condition
Message about the health benefits of eating vegetables
• Descriptive Social Norm
Message suggesting most people eat plenty of vegetables
• Liking Social Norm
Message suggesting most people like eating vegetables

Locations

Country	Name	City	State
United Kingdom	University of Birmingham	Birmingham	West Midlands

Sponsors (2)

Lead Sponsor	Collaborator
University of Birmingham	Economic and Social Research Council, United Kingdom

Country where clinical trial is conducted

United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Grams of vegetables consumed		8 months	No