Can your diet reshape your gut bacteria? 10,000 adults put it to the test

NCT ID NCT06941090

Knowledge-focused Sponsor: Institut National de la Santé Et de la Recherche Médicale, France Source: ClinicalTrials.gov ↗

First seen Jul 31, 2026 · Last updated Jul 31, 2026

Summary

This study aims to understand the links between nutrition, gut microbiota, and health by collecting stool samples from 10,000 adults in France. Participants will provide samples at home, which will be analyzed to determine their gut bacteria profiles. These profiles will then be compared with detailed dietary and health data to explore how food influences the microbiome and whether certain gut bacteria are associated with various conditions.

What this could mean

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

Active substance: stool self-sampling kit for gut microbiota analysis
What this could lead to: If successful, this could reveal how specific diets alter gut bacteria, potentially guiding future nutrition-based strategies for preventing or managing diseases.
What could go wrong: This is an observational study, not a treatment trial, so it cannot prove cause and effect. Results may be influenced by many unmeasured factors, and findings may not apply to broader populations.

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 10,000 people

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

Started

Dec 2023

Expected to finish

Dec 2033

An estimate. End dates often move.

Lead sponsor

A government agency

The lead sponsor is a government body.

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: * Participant in the NutriNet-Santé cohort * Age ≥ 18 years * Resident of metropolitan France * Written comprehension frenc Exclusion Criteria: * Person subject to a safeguard of justice measure * Person belonging to one of the categories of vulnerable persons * Diagnosis of COVID-19 (clinically or by PCR) in the month prior to collection * Contact with a COVID-19 patient in the month prior to collection * Suspicion of COVID-19 in the month preceding collection (clinical signs of infection : fever associated with headache, respiratory signs, os anosmia/ageusia)

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As listed by the trial registrant

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

Gut microbiome

How to take part

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

The places running it

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

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

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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.

Can your diet reshape your gut bacteria? 10,000 adults put it to the test

What the study statuses mean