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Breath test could reveal how your gut handles fiber

NCT ID NCT07594600

Knowledge-focused Sponsor: Örebro University, Sweden 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at how eating low or high amounts of fiber changes the compounds in your breath and gut. Twenty healthy adults will try both a low-fiber (10g/day) and a high-fiber (40g/day) diet for three days each, with a three-week break in between. Researchers will measure breath and stool samples to see how gut bacteria break down fiber. The goal is to find simple breath markers that could help understand digestion better.

What this could mean

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

Active substance
dietary fiber (low and high doses)
What this could lead to
If successful, this could help identify breath markers that show how well the body digests fiber, potentially guiding personalized nutrition advice.
What could go wrong
This is a very small, early-stage study with only 20 healthy participants, so results may not apply to everyone. It is designed to gather knowledge, not to test a treatment.

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 20 people

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

Expected to start

May 2026

An estimate. Start dates often move.

Expected to finish

Mar 2027

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 to 65 years

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: 1. Signed informed consent obtained prior to any study-related procedures. 2. Willingness to refrain from regular consumption of prebiotic or probiotic products, as well as medications known to affect gastrointestinal function, for at least four weeks prior to the study visits. Exclusion Criteria: 1. History of complicated gastrointestinal surgery. 2. Presence of a gastrointestinal diagnosis or any condition that, in the opinion of the principal investigator, may influence the study outcomes. 3. Current diagnosis of a psychiatric disorder. 4. Systemic use of antibiotics or steroid medications within the past 3 months. 5. Frequent use of NSAIDs (non-steroidal anti-inflammatory drugs) within the 2 months preceding the study visit. 6. Regular consumption of prebiotic or probiotic products within the past 4 weeks. 7. Alcohol or substance abuse. 8. Current smoking or use of nicotine pouches. 9. Frequent use of laxatives, antidiarrheal agents, or anticholinergic medications within the 12 weeks preceding the study visit. 10. Pregnancy or breastfeeding. 11. Respiratory disease or infection.

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As listed by the trial registrant

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

Association between dietary fiber intake and volatile organic compound profiles in exhaled breath Dietary fiber fermentation Healthy adult participants Healthy adults

How to take part

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  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

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Contacts and locations

Locations

  • Örebro University

    RECRUITING

    Örebro, Sweden

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