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Fasting plus fibre: a Gut-Boosting combo?

NCT ID NCT07691736

Knowledge-focused Sponsor: Buchinger Wilhelmi Development & Holding GmbH Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 09, 2026 · Last updated Jul 10, 2026 · Updated 1 time

Summary

This study explores whether taking a dietary fibre supplement during a 10-day fast can improve gut health and metabolism more than fasting alone. Overweight adults (BMI 25 or higher) will fast at a clinic and then either receive a resistant starch fibre or a placebo. Researchers will measure changes in gut bacteria, blood sugar, and other health markers to see if the combination offers extra benefits.

What this could mean

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

Active substance
maize-derived resistant starch type IV (dietary fibre)
What this could lead to
If successful, this could point toward a simple way to enhance the metabolic benefits of fasting by adding fibre, potentially improving gut health and blood sugar control.
What could go wrong
This is an early proof-of-concept study with a small number of participants, so results may not apply broadly. The fibre supplement may cause digestive discomfort, and the fasting protocol is intensive.

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 75 people

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

Expected to start

Sep 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: * Men and women * Age: 18-65 years old * Fasting for 10±4 days at the Buchinger Wilhelmi clinic in Überlingen * BMI ≥ 25 kg/m² * Signed informed consent Exclusion Criteria: * intake of antibiotics up to 2 months prior the study * regular intake of pre-, post- and probiotics up to 2 months prior the study * diagnosed Crohn's disease, Ulcerative colitis, IBD, coeliac disease * medicated high blood pressure * diagnosed diabetes mellitus type I * medicated diabetes mellitus type II * diagnosed kidney stone * active malignant disease * known substance addiction * pregnancy or breastfeeding * diagnosed with cachexia, anorexia nervosa, advanced kidney, liver or cerebrovascular insufficiency * inability to sign the informed consent * participation in another study

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Conditions

The condition(s) this trial relates to.

Fasting Ketosis metabolic disease Obesity obesity disorder Overweight

As listed by the trial registrant

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

Dietary fibre Fasting Gut microbiome Metabolism changes Overweight/obesity

How to take part

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

  1. The study's own enquiry address

    This study publishes an address for enquiries. See it below .

  2. The places running it

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

  3. 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 ↗

  4. 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

  • Buchinger Wilhelmi Development & Holding

    Überlingen, Baden-Wurttemberg, 88662, Germany

    Contact Email: •••••@•••••

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