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

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ClinicalTrials.gov Identifier: NCT02618174
Recruitment Status : Completed
First Posted : December 1, 2015
Last Update Posted : December 1, 2015
Sponsor:
Collaborator:
Economic and Social Research Council, United Kingdom
Information provided by (Responsible Party):
University of Birmingham

Tracking Information
First Submitted Date  ICMJE November 24, 2015
First Posted Date  ICMJE December 1, 2015
Last Update Posted Date December 1, 2015
Study Start Date  ICMJE October 2013
Actual Primary Completion Date July 2014   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures  ICMJE
 (submitted: November 27, 2015)
Grams of vegetables consumed [ Time Frame: 8 months ]
Original Primary Outcome Measures  ICMJE Same as current
Change History No Changes Posted
Current Secondary Outcome Measures  ICMJE Not Provided
Original Secondary Outcome Measures  ICMJE Not Provided
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
 
Descriptive Information
Brief Title  ICMJE Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.
Official Title  ICMJE Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.
Brief 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).
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.

Study Type  ICMJE Interventional
Study Phase  ICMJE Not Applicable
Study Design  ICMJE Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Condition  ICMJE Eating Behaviour
Intervention  ICMJE
  • Behavioral: Neutral Control Condition
    Message about age of University of Birmingham
  • Behavioral: Food-based Control Condition
    Message about variety of vegetables in the world
  • Behavioral: Health Condition
    Message about the health benefits of eating vegetables
  • Behavioral: Descriptive Social Norm
    Message suggesting most people eat plenty of vegetables
  • Behavioral: Liking Social Norm
    Message suggesting most people like eating vegetables
Study Arms  ICMJE
  • Placebo Comparator: Neutral Control Condition
    Message about age of University of Birmingham
    Intervention: Behavioral: Neutral Control Condition
  • Placebo Comparator: Food-based Control Condition
    Message about variety of vegetables in the world
    Intervention: Behavioral: Food-based Control Condition
  • Active Comparator: Health Condition
    Message about the health benefits of eating vegetables
    Intervention: Behavioral: Health Condition
  • Active Comparator: Descriptive Social Norm
    Message suggesting most people eat plenty of vegetables
    Intervention: Behavioral: Descriptive Social Norm
  • Experimental: Liking Social Norm
    Message suggesting most people like eating vegetables
    Intervention: Behavioral: Liking Social Norm
Publications * Thomas JM, Liu J, Robinson EL, Aveyard P, Herman CP, Higgs S. The Effects of Liking Norms and Descriptive Norms on Vegetable Consumption: A Randomized Experiment. Front Psychol. 2016 Mar 30;7:442. doi: 10.3389/fpsyg.2016.00442. eCollection 2016.

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Recruitment Information
Recruitment Status  ICMJE Completed
Actual Enrollment  ICMJE
 (submitted: November 27, 2015)
400
Original Actual Enrollment  ICMJE Same as current
Actual Study Completion Date  ICMJE July 2014
Actual Primary Completion Date July 2014   (Final data collection date for primary outcome measure)
Eligibility Criteria  ICMJE

Inclusion Criteria:

  • Healthy volunteers
  • Sufficiently fluent in English

Exclusion Criteria:

  • Smokers
  • Diabetes
  • Food allergies
  • Past / present depression or anxiety
  • Past / present eating disorder.
Sex/Gender  ICMJE
Sexes Eligible for Study: All
Ages  ICMJE 18 Years to 65 Years   (Adult, Older Adult)
Accepts Healthy Volunteers  ICMJE Yes
Contacts  ICMJE Contact information is only displayed when the study is recruiting subjects
Listed Location Countries  ICMJE United Kingdom
Removed Location Countries  
 
Administrative Information
NCT Number  ICMJE NCT02618174
Other Study ID Numbers  ICMJE UBirmingham-SNS1
Has Data Monitoring Committee No
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement  ICMJE Not Provided
Responsible Party University of Birmingham
Study Sponsor  ICMJE University of Birmingham
Collaborators  ICMJE Economic and Social Research Council, United Kingdom
Investigators  ICMJE
Principal Investigator: Jason M Thomas, PhD University of Birmingham
PRS Account University of Birmingham
Verification Date November 2015

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP