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Your gut bacteria may decide how many calories you keep

NCT ID NCT06932666

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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

Summary

This study looked at how the tiny organisms in your gut (the microbiome) affect how many calories your body absorbs from food. Researchers measured methane in breath as a clue to different gut bacteria types. Sixty healthy adults ate two special diets that had the same calories but different fibers to see how their gut microbes changed calorie loss in stool.

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

60 people

The number who actually took part.

Started

May 2025

Finished

May 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 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: * 18-65 years old * BMI:18.5-29.9 kg/m2 * Self-reported regular defecations defined as at least every second day * Willing to collect urine and stool samples at home and able to temporarily store them in their own freezer in a provided container * Willing to exclusively eat the food provided * Owning a smartphone (iOS 11.0 and onwards, or Android 5.0 and onwards) with access to the internet * Speak and understand Danish or English Exclusion Criteria: * Current pregnancy or lactation * Following a specific dietary program or diet (e.g., vegetarian, vegan, gluten-free) or unable to consume the food provided * Diagnosis of small intestinal bacterial overgrowth (SIBO), inflammatory bowel diseases (IBD), gastrointestinal obstruction, or ischemic colitis * Diagnosed chronic constipation * Regular use of diarrhea inhibitors or laxatives * Any chronic disease that can affect the outcomes of the study * Use of medications potentially altering gastric pH (proton pump inhibitors, histamine receptor antagonists, antacids) * Use of medications potentially altering the gastro-intestinal motility (prokinetics, antiemetic agents, anticholinergic agents, narcotic analgesics, nonsteroidal anti-inflammatory drugs, peroral glucocorticoids, and GLP-1 related medications such as semaglutide and liraglutide) * Use of antibiotics, or any medication that can affect any outcomes of the study, within the previous three months * Concurrent participation in another trial * Any condition that makes the project responsible and/or the clinical responsible doubt the feasibility of the volunteer's participation

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As listed by the trial registrant

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

Breath analysis Diet, healthy

Contacts and locations

Locations

  • University of Copenhagen, Department of Nutrition, Exercise and Sports

    Frederiksberg, Capital Region, 1958, Denmark

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