Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.
1 other identifier
interventional
400
1 country
1
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).
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P75+ for not_applicable
Started Oct 2013
Shorter than P25 for not_applicable
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
Study Start
First participant enrolled
October 1, 2013
CompletedPrimary Completion
Last participant's last visit for primary outcome
July 1, 2014
CompletedStudy Completion
Last participant's last visit for all outcomes
July 1, 2014
CompletedFirst Submitted
Initial submission to the registry
November 24, 2015
CompletedFirst Posted
Study publicly available on registry
December 1, 2015
CompletedDecember 1, 2015
November 1, 2015
9 months
November 24, 2015
November 27, 2015
Conditions
Outcome Measures
Primary Outcomes (1)
Grams of vegetables consumed
8 months
Study Arms (5)
Neutral Control Condition
PLACEBO COMPARATORMessage about age of University of Birmingham
Food-based Control Condition
PLACEBO COMPARATORMessage about variety of vegetables in the world
Health Condition
ACTIVE COMPARATORMessage about the health benefits of eating vegetables
Descriptive Social Norm
ACTIVE COMPARATORMessage suggesting most people eat plenty of vegetables
Liking Social Norm
EXPERIMENTALMessage suggesting most people like eating vegetables
Interventions
Message about age of University of Birmingham
Message about variety of vegetables in the world
Message suggesting most people eat plenty of vegetables
Eligibility Criteria
You may qualify if:
- Healthy volunteers
- Sufficiently fluent in English
You may not qualify if:
- Smokers
- Diabetes
- Food allergies
- Past / present depression or anxiety
- Past / present eating disorder.
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
University of Birmingham
Birmingham, West Midlands, B15 2TT, United Kingdom
Related Publications (1)
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.
PMID: 27065913DERIVED
MeSH Terms
Conditions
Condition Hierarchy (Ancestors)
Study Officials
- PRINCIPAL INVESTIGATOR
Jason M Thomas, PhD
University of Birmingham
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- RANDOMIZED
- Masking
- SINGLE
- Who Masked
- PARTICIPANT
- Intervention Model
- PARALLEL
- Sponsor Type
- OTHER
- Responsible Party
- SPONSOR
Study Record Dates
First Submitted
November 24, 2015
First Posted
December 1, 2015
Study Start
October 1, 2013
Primary Completion
July 1, 2014
Study Completion
July 1, 2014
Last Updated
December 1, 2015
Record last verified: 2015-11