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Tax junk food, subsidize veggies: will it work?

NCT ID NCT07593937

Knowledge-focused Sponsor: University of Paris 13 Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jul 01, 2026 · Updated 3 times

Summary

This study will test whether adding taxes to unhealthy foods and giving discounts on healthy foods changes what people buy in an online grocery store. About 2,239 adults from all income levels will participate, with some getting only taxes, some only subsidies, some both, and a control group with no price changes. The goal is to see if these policies improve the overall nutritional quality of purchases, especially for lower-income households.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Taxation on unhealthy foods and subsidies for healthy foods
What this could lead to
If successful, this could show that combining taxes and subsidies improves diet quality and reduces health inequalities, guiding future food policies.
What could go wrong
This is an online shopping simulation, not real-world behavior, and results may not translate to actual purchases or long-term habits. The study is not yet recruiting.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 2,239 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jun 2026

Expected to finish

Sep 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

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.

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Conditions

The condition(s) this trial relates to.

nutritional disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Food purchasing intention Nutrition

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Université Sorbonne Paris Nord

    RECRUITING

    Bobigny, 93000, France

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