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Can a low FODMAP diet soothe IBS even without lactose issues?

NCT ID NCT05120752

Symptom relief Sponsor: Universitair Ziekenhuis Brussel 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This phase 3 trial tests whether a low FODMAP diet can improve symptoms and quality of life in people with moderate to severe irritable bowel syndrome (IBS) who do not have lactose malabsorption. Sixty participants will follow the diet with guidance from a dietitian. The goal is to see if this restrictive diet still helps when lactose digestion is normal.

What this could mean

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

Active substance
low FODMAP diet
What this could lead to
If successful, this could show that a low FODMAP diet helps ease IBS symptoms even in people without lactose issues, offering a clear dietary option.
What could go wrong
This is a small, early-phase trial with only 60 people. It may not prove effective for everyone, and the restrictive diet can be hard to follow.

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

Phase 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Participants

About 60 people

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

Started

Nov 2021

Expected to finish

Jan 2028

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 75 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * \- Patients aged 18 - 75 years; * Fulfilling the ROME IV criteria for IBS; * Moderate symptom severity as defined by a IBS-SSS \> 175; * Consumption of lactose containing products. Exclusion Criteria: * \- Clinical suspicion of an organic disorder different from LI or IBS (patients can be included when this disorder had been excluded); * Known lactose intolerance; * Known inflammatory bowel disorder; * Known major intestinal motility disorder; * Alcohol (defined as more than 14 U per week) or other substance abuse; * Active psychiatric disorder; * Known systemic or auto-immune disorder with implication for the GI system; * Prior abdominal surgery (with the exception of appendectomy); * Any prior diagnosis of cancer other than basocellular carcinoma; * Current chemotherapy; * History of gastro-enteritis in the past 8 weeks; * Intake of antibiotics, pre- or probiotics during the past 8 weeks; * Dietary supplements unless taken at a stable dose for more than 8 weeks; * Treatment with neuromodulators (one neuromodulator taken at a stable dose for more than 12 weeks is allowed); * Treatment with spasmolytic agents, opioids, loperamide, gelatin tannate or mucoprotectants during the past 8 weeks; * LFD or low FODMAP diet in the past.

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Conditions

The condition(s) this trial relates to.

irritable bowel syndrome

As listed by the trial registrant

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

Irritable bowel syndrome

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

  • UZ Brussel

    RECRUITING

    Jette, Brussels Capital, 1090, Belgium

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