Do Warning Labels Decrease Soda Purchasing?
1 other identifier
interventional
6,000
0 countries
N/A
Brief Summary
Investigators will run a field study evaluating the impact different labels have on the purchasing of sugar sweetened beverages. This field study will take place in a hospital cafeteria.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P75+ for not_applicable healthy
Started Apr 2016
Shorter than P25 for not_applicable healthy
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
Study Start
First participant enrolled
April 1, 2016
CompletedFirst Submitted
Initial submission to the registry
April 13, 2016
CompletedFirst Posted
Study publicly available on registry
April 20, 2016
CompletedPrimary Completion
Last participant's last visit for primary outcome
July 1, 2016
CompletedStudy Completion
Last participant's last visit for all outcomes
July 1, 2016
CompletedOctober 4, 2018
October 1, 2018
3 months
April 13, 2016
October 2, 2018
Conditions
Keywords
Outcome Measures
Primary Outcomes (1)
Sweetened beverages purchased
We will sum the total number of sugar sweetened beverages sold in each condition using the Universal Product Code (UPC) for bottled beverages and syrup weight for fountain beverages.
2 week condition blocks
Secondary Outcomes (3)
Unsweetened beverages purchased
2 week condition blocks
Beverage calories sold
2 week condition blocks
Changes in types of beverages purchased
2 week condition blocks
Study Arms (4)
Calorie Label
EXPERIMENTALLabels will read "\[lower calorie bound\] - \[upper calorie bound\] calories per container. 2,000 calories a day is used for general nutrition advice but calorie needs vary."
Warning Label
EXPERIMENTALLabels will read "WARNING: Drinking beverages with added sugar(s) contributes to obesity, diabetes, and tooth decay."
Warning Label with Graphics
EXPERIMENTALLabels will read "WARNING: Drinking beverages with added sugar(s) contributes to obesity, diabetes, and tooth decay." These labels will also have graphic depictions of each health condition above the corresponding text.
No label
NO INTERVENTIONWe will also have a condition where no labels are presented-- business as usual.
Interventions
Labels will be presented in front of drinks. We will vary the messaging presented to the consumer.
Eligibility Criteria
You may qualify if:
- Customers of the hospital cafeteria.
You may not qualify if:
- None
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Related Publications (1)
Donnelly GE, Zatz LY, Svirsky D, John LK. The Effect of Graphic Warnings on Sugary-Drink Purchasing. Psychol Sci. 2018 Aug;29(8):1321-1333. doi: 10.1177/0956797618766361. Epub 2018 Jun 18.
PMID: 29912624DERIVED
Study Officials
- PRINCIPAL INVESTIGATOR
Grant E Donnelly, MA
Harvard University
- PRINCIPAL INVESTIGATOR
Laura Y Zatz, MPH
Harvard School of Public Health (HSPH)
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- TREATMENT
- Intervention Model
- CROSSOVER
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- Principal Investigator
Study Record Dates
First Submitted
April 13, 2016
First Posted
April 20, 2016
Study Start
April 1, 2016
Primary Completion
July 1, 2016
Study Completion
July 1, 2016
Last Updated
October 4, 2018
Record last verified: 2018-10