Changing Portion Size Descriptions in a Cafeteria

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

101481 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-01-11

Study Completion Date

2024-05-29

Brief Summary

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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.

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Detailed Description

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The investigators will work with two cafés that will start offering two size options for their entrées. The cafés will go through three phases: a baseline phase where there are two portion sizes and no intervention (6 weeks), an intervention phase where the portion size labeling strategy will be implemented (7 weeks), and then a final phase where the portion size intervention is removed (7 weeks). During the baseline period, the smaller-sized entrée will not receive a label, and the larger-sized entrée will be called "Large." During the intervention period for the control café, labeling will stay the same, but in the intervention café, the smaller size will be labeled "Standard" and the larger size will be called "Large." In the post-intervention period, the smaller-sized entrée in the intervention café will have no label so that it resembles the control café.

Conditions

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Food Selection Obesity Weight Gain Food Preferences

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Entrees are offered in two different portion sizes at two cafes. The cafes were randomized to either receive the "Standard" portion label for the smaller size (Intervention) or the "Small" portion label for the smaller size (Control). The larger portion was labeled "Large." Daily lunch transaction data will be provided by the cafes.

Primary Study Purpose

PREVENTION

Blinding Strategy

NONE

Study Groups

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Intervention "Standard"

The smaller entree is labeled "Standard" and the larger entree is labeled "Large."

Group Type EXPERIMENTAL

Intervention "Standard"

Intervention Type BEHAVIORAL

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.

Control "Small"

The smaller entree is labeled "Small" and the larger entree is labeled "Large."

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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Intervention "Standard"

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.

Intervention Type BEHAVIORAL