- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT06263621
Changing Portion Size Descriptions in a Cafeteria
Changing Restaurant Portion Size Descriptions to Encourage Selection and Intake of Smaller Meals: a Field Experiment
The goal of this this intervention is to test the degree to which a portion size labeling intervention influences consumer selection of smaller portions at two large cafés. The main question it aims to answer is: Do consumers order fewer calories when the portion size label for the smaller entree is called "standard" instead of "small"?
Participants will order lunch as usual in the two cafes (one intervention, one control) for 5.5 months, and all order items will be recorded in the check-out system. One cafe will receive the labeling intervention, while the other will not. Researchers will compare the average calories per order between the two cafes to see if there are differences.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Massachusetts
-
Boston, Massachusetts, United States, 02115
- Courtyard Cafe
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Boston, Massachusetts, United States, 02115
- Elements Cafe
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- All customers who make a lunch purchase at the cafes
Exclusion Criteria:
- Purchases made outside of lunch service.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Intervention "Standard"
The smaller entree is labeled "Standard" and the larger entree is labeled "Large."
|
The two cafes will offer entrees in two sizes, a smaller and larger size.
In the intervention cafe, the smaller size will be labeled "Standard" during the intervention period, and "Small" during all other times.
In the control cafe, the smaller size will always be labeled "Small."
The larger size will always be labeled "Large" for both cafes during the duration of the study.
Other Names:
|
No Intervention: Control "Small"
The smaller entree is labeled "Small" and the larger entree is labeled "Large."
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Average kcal per entree sold
Time Frame: Daily sales data for 5.5 months
|
The primary outcome will be the average kcal per entrée purchased.
|
Daily sales data for 5.5 months
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of entrée units purchased
Time Frame: Daily sales data for 5.5 months
|
Analyzing the number of entrée units purchased will enable the investigators to assess the impact of the intervention on entree sales.
|
Daily sales data for 5.5 months
|
Total kcal per transaction
Time Frame: Daily sales data for 5.5 months
|
This will allow the investigators to examine whether participants who ordered a reduced-sized entrée were ordering more calories in other parts of the meal (i.e., a dessert).
|
Daily sales data for 5.5 months
|
Weekly gross sales
Time Frame: Daily sales data for 5.5 months
|
This will allow the investigators to assess whether the addition of a reduced-sized entrée at a lower cost negatively affected lunch service revenue.
|
Daily sales data for 5.5 months
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Sophia V Hua, PhD, MPH, University of Pennsylvania
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 855090
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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