Taxation and Subsidies to Influence Food Purchases
Official title: Impact of Taxation and Subsidies on the Nutrition Quality of Purchases in an Online Experimental Supermarket, Overall and by Income Level: a Randomized Control Trial
Run by University of Paris 13 · NCT07593937 · Data updated 2026-11-12
This study tests whether applying taxes on unhealthy foods and subsidies for healthy foods can shift what adults buy, including those in a low-income group.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 2239 (estimated) |
| Sponsor | University of Paris 13 Academic / other |
| Locations | 1 site (Bobigny) |
| Status | Recruiting |
| Started | June 15, 2026 |
| Main results expected | September 1, 2026 |
| Study ends | September 1, 2026 |
| Registry record updated | June 30, 2026 |
| Trial ID | NCT07593937 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults over 18 who are part of the NutriNet-Santé cohort, including low-income participants in the subsidies+taxation arm.
✕Probably not a fit
Individuals not shopping for groceries or not aligned with the NutriNet-Santé cohort may not benefit from the findings.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
The trial examines how price changes, through taxation and subsidies, affect dietary purchasing behavior among adults drawn from a large nutrition cohort. It uses experimental designs to see if higher prices on unhealthy items and lower prices on healthier options can steer choices. The study collaborates with the University of Paris 13 and Paris School of Economics and leverages participants from the NutriNet-Santé cohort. Eligibility focuses on adults, with a sub-arm including low-income participants below a defined poverty threshold. Participants must regularly grocery shop to participate.
Why it matters
Potential benefit: If successful, pricing interventions could inform policies that encourage healthier eating and reduce diet-related health risks.
How similar studies have gone: Previous experimental work has shown price changes can influence food purchases, supporting the potential for these interventions.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion criteria: * Adult subjects (\>18 years old) included in the NutriNet-Santé cohort study from all income levels. * For the subsidies + taxation arm: inclusion only of low income-participants (below the poverty threshold 1,288€ - 60% of the median standard of living of the population) Exclusion Criteria: ⁃ Subjects never engaging in grocery shopping. Participants will be excluded for this based on self-reported grocery shopping frequency using a short questionnaire at the inception of the study.
Where it's running
-
Université Sorbonne Paris Nord
Bobigny, France Recruiting
Study contacts
- Study coordinator: Chantal Julia, MD, PhD
- Email: c.julia@eren.smbh.univ-paris13.fr
- Phone: 01 48 38 89 53
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.