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This study aims to examine the effects of added sugar warning labels for sugar-sweetened beverages (SSBs) on explicit weight bias and body weight attributional judgements. Participants will be assigned to view either control labels or added sugar warning labels applied on SSBs in an experimental store. Participants will shop for beverages in the store and take a computer survey during four visits to the store, spaced approximately one week apart.
This study aims to determine whether applying added sugar warnings on sugary drinks impacts explicit weight bias and body weight attributional judgements. Approximately 543 adults (ages 18 and older) who have bought at least one SSB in the past week will attend four in-person visits at an experimental store, spaced approximately one week apart. Participants will be randomized to see either neutral control labels or added sugar labels on SSB containers during their visits to the experimental store. At each study visit, participants will shop for beverages in the store and take a computer survey. Explicit weight bias and attribution of responsibility for body weight will be assessed via the computer surveys at the first and last visit.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Control label | Other |
| |
| Added sugar warning | Experimental |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Control label | Behavioral | The control label will display a neutral, square-shaped barcode. Labels will be placed on the front of SSB containers in the experimental store. |
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| Measure | Description | Time Frame |
|---|---|---|
| Explicit weight bias, mean score | Explicit weight bias will be measured by survey through seven items. Items will present participants with pairs of antonyms and ask that they select the box between antonyms that they feel best describes their feelings and beliefs about people with obesity: (1) lazy - hard-working, (2) no will power - has will power, (3) good self - control - poor self-control, (4) active - inactive, (5) self-indulgent - self-sacrificing, (6) dislikes food - likes food, (7) undereats - overeats. Response options, which will be presented as 5 boxes between antonyms, will be coded in a categorical 1-5 range, where higher scores represent higher endorsement of a stereotype that contributes to weight bias. Each participant's responses to each item will then be averaged across the seven items to obtain their final score on the outcome in a 1-5 range, where higher scores represent higher explicit weight bias. | Assessed via survey after exposure to intervention (i.e., shopping task) 2 times approximately 4 weeks apart (i.e., in visits 1 and 4) |
| Measure | Description | Time Frame |
|---|---|---|
| Body weight attributional judgements, mean score | Body weight attributional judgements will be measured by survey through two items. Items will ask participants how much they agree with two statements: (1) People with obesity are responsible for their weight; (2) People with obesity are to blame for their weight. Response options will be on a 5-point scale from strongly disagree to strongly agree, with higher scores representing higher agreement. Each participant's responses to each item will be averaged to obtain their final score on the outcome in a 1-5 range, where higher scores represent higher attribution of personal responsibility for body weight. |
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Inclusion Criteria:
Exclusion Criteria:
• Living in the same household as someone else in the study
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Aline D'Angelo Campos, PhD, MPP | Contact | 9199663215 | adangelo-campos@unc.edu |
| Name | Affiliation | Role |
|---|---|---|
| Aline D'Angelo Campos, PhD, MPP | University of North Carolina, Chapel Hill | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| UNC MiniMart Chapel Hill | Recruiting | Chapel Hill | North Carolina | 27514 | United States |
The Study Protocol and Statistical Analysis Plan will be shared prior to data collection. After data collection and analysis, a de-identified version of individual participant data and the analytic code will be shared through the Open Science Framework (OSF).
The Study Protocol and statistical analysis plan will be available by February 2026 (prior to data collection). A de-identified version of the data collected and analytic code used will become available after data collection and analysis and will remain available indefinitely.
Open access.
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Jan 27, 2026 | Jan 27, 2026 | Prot_SAP_000.pdf |
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| Added sugar warning | Behavioral | The added sugar warning will be octagon-shaped and will state "HIGH IN ADDED SUGAR." Warnings will be placed on the front of SSB containers in the experimental store. |
|
| Assessed via survey after exposure to intervention (i.e., shopping task) 2 times approximately 4 weeks apart (i.e., in visits 1 and 4). |