Cure My Disease

Don't miss your cure!

 Log in / Sign up

Three-Day fast reshapes fat cells and boosts fat burning, study hints

NCT ID NCT07692646

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 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 09, 2026 · Last updated Jul 10, 2026 · Updated 1 time

Summary

This study investigates what happens inside the body after an 84-hour fast. Researchers will measure peak fat oxidation (how well the body burns fat during exercise), mitochondrial coupling (energy efficiency in cells), and changes in the extracellular matrix (the scaffold around fat cells). The trial includes 40 healthy adults—half with normal weight and half with obesity—to see if fasting affects these processes differently depending on body weight and sex.

What this could mean

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

Active substance
84-hour fasting
What this could lead to
If successful, this could reveal how fasting changes the body's ability to burn fat and remodel tissue, pointing toward new approaches for weight management.
What could go wrong
This is a small, early-stage study with only 40 participants. Results may not apply to older adults or people with medical conditions. Fasting for 84 hours can be difficult and may cause side effects like dizziness or fatigue.

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 40 people

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

Expected to start

Jun 2026

An estimate. Start dates often move.

Expected to finish

Dec 2033

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 40 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: * Healthy normal weight men aged \[18,40\] and BMI \[18,25\] * Healthy normal weight women \[18,40\] and BMI \[18,25\] * Healthy obese men \[18,40\] and BMI \[30,40\] * Healthy obese women \[18,40\] and BMI \[30,40\] Exclusion Criteria: * Present or former cardiovascular disease and chronical inflammatory disease * Consumption of medications and supplements that influence substrate use at rest and/or during exercise * Pregnancy

Get updates

Get notified about this study

Sign up to get updates when this study changes or when new studies for Fasting are added.

Our safety recommendation!

By submitting, you agree to our Terms of use

Conditions

The condition(s) this trial relates to.

Fasting Obesity obesity disorder

As listed by the trial registrant

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

Fasting Obesity (bmi>30) Sex difference

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

  • Department of Biomedical Sciences

    RECRUITING

    Copenhagen, 2200, Denmark

More trials for these conditions

Other studies related to the condition(s) this trial covers.