Eating BehaviourNCT02618174
Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.
A study testing Health Condition, Descriptive Social Norm and Liking Social Norm in people with Eating Behaviour, run by University of Birmingham at 1 site in United Kingdom.
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'. Read more about this study
- Who is it for?
- Ages 18 to 65 yearsHealthy volunteers can take part
- Conditions the study is for
- Eating Behaviour
- What is being tested?
- Health Condition, Descriptive Social Norm and Liking Social Norm
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 400 participants
- Where
- 1 siteUnited Kingdom
- Study dates
- Oct 2013to Jul 2014
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Healthy volunteers
- Sufficiently fluent in English
Who cannot join
- Smokers
- Diabetes
- Food allergies
- Past / present depression or anxiety
- Past / present eating disorder.
Trial locations and contacts
1 site in 1 country.
United Kingdom1 site
University of Birmingham
Birmingham, West Midlands, B15 2TT
About this study
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).
Read the 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.
- Conditions
- Eating Behaviour
- Being tested
- Neutral Control Condition, Food-based Control Condition, Health Condition, Descriptive Social Norm, Liking Social Norm
- Medical subject headings
- Feeding Behavior
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Neutral Control ConditionBehavioural
Message about age of University of Birmingham
Food-based Control ConditionBehavioural
Message about variety of vegetables in the world
Health ConditionBehavioural
Message about the health benefits of eating vegetables
Descriptive Social NormBehavioural
Message suggesting most people eat plenty of vegetables
Liking Social NormBehavioural
Message suggesting most people like eating vegetables
| Study group | Role | What they receive |
|---|---|---|
| Neutral Control Condition | Placebo comparator | Message about age of University of Birmingham Receives: Behavioral: Neutral Control Condition |
| Food-based Control Condition | Placebo comparator | Message about variety of vegetables in the world Receives: Behavioral: Food-based Control Condition |
| Health Condition | Active comparator | Message about the health benefits of eating vegetables Receives: Behavioral: Health Condition |
| Descriptive Social Norm | Active comparator | Message suggesting most people eat plenty of vegetables Receives: Behavioral: Descriptive Social Norm |
| Liking Social Norm | Experimental | Message suggesting most people like eating vegetables Receives: Behavioral: Liking Social Norm |
What is being measured
The primary outcome is the main question the study is designed to answer.
Grams of vegetables consumed
Measured: 8 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted1 Dec 2015 (estimated)
- Study startOct 2013
- Primary completionJul 2014
- Study completionJul 2014
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Eating BehaviourStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 400 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Birmingham
- Sponsor type
- University, hospital or other
- Collaborators
- Economic and Social Research Council, United Kingdom
- Responsible party
- Sponsor
- Investigators
- Jason M Thomas, PhD, Principal investigator, University of Birmingham
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02618174
- Sponsor's protocol ID
- UBirmingham-SNS1
- Status last verified
- Nov 2015
- First submitted
- 24 Nov 2015
- Last updated
- 1 Dec 2015
- Results posted
- No
- Data monitoring committee
- No
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.
PubMed 27065913
Study at a glance
From the registry record, last updated by the sponsor on 1 Dec 2015. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Enhanced Broccoli Consumption After a Liking Norm and Vegetable Variety Message: Effects After a 24 Hour Delay.
- ClinicalTrials.gov ID
- NCT02618174
- Acronym / sponsor ID
- UBirmingham-SNS1
- Conditions
- Eating Behaviour
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 400 participants (actual)
- Lead sponsor
- University of BirminghamUniversity, hospital or other
- Collaborators
- Economic and Social Research Council, United Kingdom
- Study start
- Oct 2013
- Primary completion
- Jul 2014 (actual)
- Study completion
- Jul 2014 (actual)
- First posted
- 1 Dec 2015 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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 design
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 5
| Arm | Type | Receives |
|---|---|---|
| Neutral Control Condition | Placebo comparator | Behavioral: Neutral Control ConditionMessage about age of University of Birmingham |
| Food-based Control Condition | Placebo comparator | Behavioral: Food-based Control ConditionMessage about variety of vegetables in the world |
| Health Condition | Active comparator | Behavioral: Health ConditionMessage about the health benefits of eating vegetables |
| Descriptive Social Norm | Active comparator | Behavioral: Descriptive Social NormMessage suggesting most people eat plenty of vegetables |
| Liking Social Norm | Experimental | Behavioral: Liking Social NormMessage suggesting most people like eating vegetables |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- Healthy volunteers
- Sufficiently fluent in English
Key exclusion criteria (5 listed)
- Smokers
- Diabetes
- Food allergies
- Past / present depression or anxiety
- Past / present eating disorder.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Neutral Control ConditionMessage about age of University of Birmingham | Behavioural | Neutral Control Condition |
| Food-based Control ConditionMessage about variety of vegetables in the world | Behavioural | Food-based Control Condition |
| Health ConditionMessage about the health benefits of eating vegetables | Behavioural | Health Condition |
| Descriptive Social NormMessage suggesting most people eat plenty of vegetables | Behavioural | Descriptive Social Norm |
| Liking Social NormMessage suggesting most people like eating vegetables | Behavioural | Liking Social Norm |
Primary outcome
Grams of vegetables consumed
Time frame: 8 months
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 1 Dec 2015.
- Derived from this study: PubMed 27065913Thomas 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.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Jason M Thomas, PhD principal investigator
University of Birmingham
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Health Condition, Descriptive Social Norm and Liking Social Norm in people with Eating Behaviour, run by University of Birmingham at 1 site in United Kingdom.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 1 Dec 2015. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Grams of vegetables consumed (time frame: 8 months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT02618174, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Dec 2015.