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

This study has been completed.
Sponsor:
Collaborator:
Economic and Social Research Council, United Kingdom
Information provided by (Responsible Party):
University of Birmingham
ClinicalTrials.gov Identifier:
NCT02618174
First received: November 24, 2015
Last updated: November 27, 2015
Last verified: November 2015
  Purpose
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).

Condition Intervention
Eating Behaviour
Behavioral: Neutral Control Condition
Behavioral: Food-based Control Condition
Behavioral: Health Condition
Behavioral: Descriptive Social Norm
Behavioral: Liking Social Norm

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Participant)
Official Title: Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.

Further study details as provided by University of Birmingham:

Primary Outcome Measures:
  • Grams of vegetables consumed [ Time Frame: 8 months ]

Enrollment: 400
Study Start Date: October 2013
Study Completion Date: July 2014
Primary Completion Date: July 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: Neutral Control Condition
Message about age of University of Birmingham
Behavioral: Neutral Control Condition
Message about age of University of Birmingham
Placebo Comparator: Food-based Control Condition
Message about variety of vegetables in the world
Behavioral: Food-based Control Condition
Message about variety of vegetables in the world
Active Comparator: Health Condition
Message about the health benefits of eating vegetables
Behavioral: Health Condition
Message about the health benefits of eating vegetables
Active Comparator: Descriptive Social Norm
Message suggesting most people eat plenty of vegetables
Behavioral: Descriptive Social Norm
Message suggesting most people eat plenty of vegetables
Experimental: Liking Social Norm
Message suggesting most people like eating vegetables
Behavioral: Liking Social Norm
Message suggesting most people like eating vegetables

Detailed 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.

  Eligibility

Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Healthy volunteers
  • Sufficiently fluent in English

Exclusion Criteria:

  • Smokers
  • Diabetes
  • Food allergies
  • Past / present depression or anxiety
  • Past / present eating disorder.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT02618174

Locations
United Kingdom
University of Birmingham
Birmingham, West Midlands, United Kingdom, B15 2TT
Sponsors and Collaborators
University of Birmingham
Economic and Social Research Council, United Kingdom
Investigators
Principal Investigator: Jason M Thomas, PhD University of Birmingham
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: University of Birmingham
ClinicalTrials.gov Identifier: NCT02618174     History of Changes
Other Study ID Numbers: UBirmingham-SNS1
Study First Received: November 24, 2015
Last Updated: November 27, 2015

ClinicalTrials.gov processed this record on April 24, 2017