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

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

400 participants

Study Classification

INTERVENTIONAL

Study Start Date

2013-10-31

Study Completion Date

2014-07-31

Brief Summary

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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

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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.

Conditions

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Eating Behaviour

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Blinding Strategy

SINGLE

Participants

Study Groups

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Neutral Control Condition

Message about age of University of Birmingham

Group Type PLACEBO_COMPARATOR

Neutral Control Condition

Intervention Type BEHAVIORAL

Message about age of University of Birmingham

Food-based Control Condition

Message about variety of vegetables in the world

Group Type PLACEBO_COMPARATOR

Food-based Control Condition

Intervention Type BEHAVIORAL

Message about variety of vegetables in the world

Health Condition

Message about the health benefits of eating vegetables

Group Type ACTIVE_COMPARATOR

Health Condition

Intervention Type BEHAVIORAL

Message about the health benefits of eating vegetables

Descriptive Social Norm

Message suggesting most people eat plenty of vegetables

Group Type ACTIVE_COMPARATOR

Descriptive Social Norm

Intervention Type BEHAVIORAL

Message suggesting most people eat plenty of vegetables

Liking Social Norm

Message suggesting most people like eating vegetables

Group Type EXPERIMENTAL

Liking Social Norm

Intervention Type BEHAVIORAL

Message suggesting most people like eating vegetables

Interventions

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Neutral Control Condition

Message about age of University of Birmingham

Intervention Type BEHAVIORAL

Food-based Control Condition

Message about variety of vegetables in the world

Intervention Type BEHAVIORAL

Health Condition

Message about the health benefits of eating vegetables

Intervention Type BEHAVIORAL

Descriptive Social Norm

Message suggesting most people eat plenty of vegetables

Intervention Type BEHAVIORAL

Liking Social Norm

Message suggesting most people like eating vegetables

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

* Healthy volunteers
* Sufficiently fluent in English

Exclusion Criteria

* Smokers
* Diabetes
* Food allergies
* Past / present depression or anxiety
* Past / present eating disorder.

Minimum Eligible Age

18 Years

Maximum Eligible Age

65 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Jason M Thomas, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Birmingham

Locations

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University of Birmingham

Birmingham, West Midlands, United Kingdom

Site Status

Countries

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United Kingdom

References

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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.

Reference Type DERIVED

PMID: 27065913 (View on PubMed)

Other Identifiers

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UBirmingham-SNS1

Identifier Type: -

Identifier Source: org_study_id

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

Study Results

Basic Information

Brief Summary

Detailed Description

Conditions

Study Design

Study Groups

Neutral Control Condition

Neutral Control Condition

Food-based Control Condition

Food-based Control Condition

Health Condition

Health Condition

Descriptive Social Norm

Descriptive Social Norm

Liking Social Norm

Liking Social Norm

Interventions

Neutral Control Condition

Food-based Control Condition

Health Condition

Descriptive Social Norm

Liking Social Norm

Eligibility Criteria

Inclusion Criteria

Exclusion Criteria

Sponsors

Economic and Social Research Council, United Kingdom

University of Birmingham

Responsible Party

Principal Investigators

Jason M Thomas, PhD

Locations

University of Birmingham

Countries

References

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.

Other Identifiers

UBirmingham-SNS1