SSS and the Impact of Portion Size on Daily Energy Intake
NCT ID: NCT05399836
Last Updated: 2023-01-10
Study Results
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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COMPLETED
NA
47 participants
INTERVENTIONAL
2022-05-30
2022-10-12
Brief Summary
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There is also an absence of evidence examining the moderating role of subjective social status (SSS) - an individual's perceived standing in society - on the PSE. Given evidence that the subjective experience of social class may be associated with health outcomes, the present study examines whether reductions to the portion size reduces daily energy intake, and whether and how SSS (higher vs lower) moderates the PSE.
In a crossover experiment, participants will be served all meals in the lab on two separate days, with the portion size of main components at breakfast, lunch and dinner manipulated (i.e. smaller on one day vs larger on the other day). All other foods offered are identical. Food intake from the portion-manipulated breakfast, lunch and dinner, as well as all other meal components (non-portion-manipulated sides, dessert, seconds, snacks, etc.) will be measured, to assess total daily energy intake (kcal).
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Detailed Description
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Conditions
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Study Design
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RANDOMIZED
CROSSOVER
PREVENTION
SINGLE
Study Groups
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Larger portions
the main meal component (lunch/dinner) served to participants in the laboratory, reflecting 100% portion. All other foods are identical across conditions (e.g. sides, seconds, dessert, snacks).
Portion size manipulation
The intervention will be administered via changing portion sizes of foods served to participants.
Smaller portions
the main meal component (lunch/dinner) served to participants in the laboratory, reflecting 66% portion (i.e. reduced portion size). All other foods are identical across conditions (e.g. sides, seconds, dessert, snacks).
Portion size manipulation
The intervention will be administered via changing portion sizes of foods served to participants.
Interventions
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Portion size manipulation
The intervention will be administered via changing portion sizes of foods served to participants.
Eligibility Criteria
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Inclusion Criteria
* UK (United Kingdom) residents, able to visit laboratory in Liverpool
* Aged 18 or over
* Fluent in English
* willing to consume the test foods
* Self report willingness to eat test foods
* BMI between 18.5 - 32.5kg2
Exclusion Criteria
* food allergies, intolerances or specific dietary requirements (except vegetarian)
* taking medication which affects appetite
* currently pregnant
* history of eating disorders
* currently on a diet to lose weight
18 Years
FEMALE
Yes
Sponsors
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European Research Council
OTHER
University of Liverpool
OTHER
Responsible Party
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Eric Robinson
Principal Investigator (Professor in Psychological Sciences)
Principal Investigators
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Eric Robinson, PhD
Role: PRINCIPAL_INVESTIGATOR
University of Liverpool
Locations
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University of Liverpool
Liverpool, , United Kingdom
Countries
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References
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Langfield T, Clarke K, Marty L, Jones A, Robinson E. Socioeconomic position and the influence of food portion size on daily energy intake in adult females: two randomized controlled trials. Int J Behav Nutr Phys Act. 2023 Apr 27;20(1):53. doi: 10.1186/s12966-023-01453-x.
Study Documents
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Document Type: Statistical Analysis Plan
View DocumentDocument Type: Individual Participant Data Set
The study protocol and statistical analysis plan were pre-registered on the OSF prior to starting recruitment. Participant dataset (anonymised) will be made available when results are published.
View DocumentOther Identifiers
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803194 SSS PSE
Identifier Type: -
Identifier Source: org_study_id
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