Portion SizeNCT03731273
Compensation for Smaller Portion Sizes and Portion Size Normality
A study testing portion size in people with Portion Size, run by University of Liverpool at 1 site in United Kingdom.
Trial summary
Reducing food portion size is a potential strategy to reduce energy intake. However it is unclear at what point consumers compensate for reductions in portion size by increasing energy intake from other items. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Portion Size
- What is being tested?
- portion size
- Type of treatment
- Lifestyle or therapy programme
- How many people
- 90 participants
- Where
- 1 siteUnited Kingdom
- Study dates
- 4 Oct 2016to 25 Jul 2017
- 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 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- general liking and willingness to consume the test foods in each study
Who cannot join
- food allergies, intolerances or specific dietary requirements (including being vegetarian or vegan)
- a history of eating disorders;
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Compensation for Smaller Portion Sizes and Portion Size Normality: Two Laboratory
Reducing food portion size is a potential strategy to reduce energy intake. However it is unclear at what point consumers compensate for reductions in portion size by increasing energy intake from other items. The investigators tested the hypothesis that reductions to food portion size will only result in significant compensatory eating when the reduced portion size is no longer visually perceived as 'normal'. In two within-subjects experiments, participants (Study 1: N = 45, M BMI = 26.9; Study 2: N = 37, M BMI = 26.9; 51% female) were served different sized portions of a lunchtime meal on three occasions: a 'large-normal', a 'small-normal', and a 'smaller than normal' portion. Both the reduction from 'large-normal' to 'small-normal' and from 'small-normal' to 'smaller than normal' portions represented the same change in food volume and energy content (84g, 77kcal Study 1; 98g, 117kcal Study 2). Participants were able to serve themselves additional helpings of the same food (Study 1), or dessert items (Study 2).
- Conditions
- Portion Size
- Being tested
- portion size
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
portion sizeBehavioural
Smaller than normal portion size - the intervention is the meal size perceived as 'smaller than normal' that participants are provided with during a lunchtime session in the laboratory.
'Small-normal' portion size - the intervention is the meal size perceived as 'small normal' that participants are provided with during a lunchtime session in the laboratory.
'Large normal' portion size - the intervention is the meal size perceived as 'large normal' that participants are provided with during a lunchtime session in the laboratory.
What is being measured
The primary outcome is the main question the study is designed to answer.
Meal energy intake
Energy intake from the served portion
Measured: Immediate
'Compensatory' (additional) energy intake
Energy intake from additional food provided for consumption after the portion-manipulated meal
Measured: Immediate
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted6 Nov 2018
- Study start4 Oct 2016
- Primary completion25 Jul 2017
- Study completion25 Jul 2017
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Portion SizeStudies 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
- Primary purpose
- Prevention
- Intervention model
- Crossover
- Masking
- None (open label)
- Enrolment
- 90 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Liverpool
- Sponsor type
- University, hospital or other
- Collaborators
- Medical Research Council
- Responsible party
- Principal investigator, Eric Robinson, University of Liverpool
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03731273
- Sponsor's protocol ID
- Portion size normality
- Status last verified
- Nov 2018
- First submitted
- 2 Nov 2018
- Last updated
- 6 Nov 2018
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: IPD is available on the Open Science Framework https://osf.io/txf9u/
Study at a glance
From the registry record, last updated by the sponsor on 6 Nov 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Compensation for Smaller Portion Sizes and Portion Size Normality: Two Laboratory
- ClinicalTrials.gov ID
- NCT03731273
- Acronym / sponsor ID
- Portion size normality
- Conditions
- Portion Size
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 90 participants (actual)
- Lead sponsor
- University of LiverpoolUniversity, hospital or other
- Collaborators
- Medical Research Council
- Study start
- 4 Oct 2016 (actual)
- Primary completion
- 25 Jul 2017 (actual)
- Study completion
- 25 Jul 2017 (actual)
- First posted
- 6 Nov 2018 (actual)
- 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.
Reducing food portion size is a potential strategy to reduce energy intake. However it is unclear at what point consumers compensate for reductions in portion size by increasing energy intake from other items. The investigators tested the hypothesis that reductions to food portion size will only result in significant compensatory eating when the reduced portion size is no longer visually perceived as 'normal'. In two within-subjects experiments, participants (Study 1: N = 45, M BMI = 26.9; Study 2: N = 37, M BMI = 26.9; 51% female) were served different sized portions of a lunchtime meal on three occasions: a 'large-normal', a 'small-normal', and a 'smaller than normal' portion. Both the reduction from 'large-normal' to 'small-normal' and from 'small-normal' to 'smaller than normal' portions represented the same change in food volume and energy content (84g, 77kcal Study 1; 98g, 117kcal Study 2). Participants were able to serve themselves additional helpings of the same food (Study 1), or dessert items (Study 2).
Study design
- Primary purpose
- Prevention
- Intervention model
- Crossover
- Masking
- None (open label)
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- general liking and willingness to consume the test foods in each study
Key exclusion criteria (2 listed)
- food allergies, intolerances or specific dietary requirements (including being vegetarian or vegan)
- a history of eating disorders;
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 |
|---|---|---|
| portion sizeSmaller than normal portion size - the intervention is the meal size perceived as 'smaller than normal' that participants are provided with during a lunchtime session in the laboratory. 'Small-normal' portion size - the intervention is the meal size perceived as 'small normal' that participants are provided with during a lunchtime session in the laboratory. 'Large normal' portion size - the intervention is the meal size perceived as 'large normal' that participants are provided with during a lunchtime session in the laboratory. | Behavioural | – |
Primary outcome
Meal energy intake
Time frame: Immediate
Energy intake from the served portion
'Compensatory' (additional) energy intake
Time frame: Immediate
Energy intake from additional food provided for consumption after the portion-manipulated meal
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 6 Nov 2018.
- Individual participant dataSharing planned: Yes. IPD is available on the Open Science Framework https://osf.io/txf9u/
Related trials for Portion Size
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The Growing Well Study
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RecruitingObservational study
Eating Behaviour Before, During, and After Obesity Medication
Obesity Type 2 Diabetes Mellitus, Obesity & Overweight
Active, not recruiting
The Effect of Portion Sizes on Mood
Mood, Eating Patterns
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.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing portion size in people with Portion Size, run by University of Liverpool 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 1 inclusion and 2 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 6 Nov 2018. 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. 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?
Meal energy intake (time frame: Immediate). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 6 Nov 2018.