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Warning labels and tax on junk food tested in UK supermarket study

NCT ID NCT07339982

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

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Sep 04, 2026 · Updated 2 times

Summary

This study tests whether putting warning labels on unhealthy foods and adding a 20% tax changes what people buy. Around 600 UK adults will shop in a simulated online Tesco store. Researchers will compare the nutritional quality of their orders across four groups: labels only, labels plus tax, current traffic-light labels plus tax, and a control group with no changes.

What this could mean

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

What this could lead to
If it works, this could show that simple labels and taxes help people choose healthier foods, which might guide future public health policies.
What could go wrong
This is a small, short-term study using a simulated online shop, not real-world behavior. Results may not reflect actual long-term shopping habits.

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

829 people

The number who actually took part.

Started

Feb 2026

Finished

Jul 2026

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: * Are a UK resident * Are aged 18 years and above * Are fluent in English * Have access to a laptop/desktop computer with internet access * Are willing to order, pay for, and eat a ready meal from Tesco for an evening meal * Can access Home Delivery/Whoosh/Click \& Collect from Tesco * Do not have any major dietary restrictions (e.g., vegetarian, vegan, gluten-free) * Are not on any medication which affects appetite * Do not have a current or past eating disorder diagnosis

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As listed by the trial registrant

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

Nutrition labeling Tax policy

Contacts and locations

Locations

  • Online (UK-wide) - Qualtrics

    Liverpool, United Kingdom

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