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Protein and exercise after bariatric surgery: a Muscle-Saving combo?

NCT ID NCT07156552

Disease control Sponsor: Radboud University Medical Center 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 12, 2026 · Updated 3 times

Summary

This study tests whether taking daily protein supplements and doing resistance exercises (like lifting weights) can prevent too much muscle loss after bariatric surgery. About 400 patients will be randomly assigned to either standard care or standard care plus the protein and exercise program. The goal is to see if the extra support helps people lose more fat and less muscle.

What this could mean

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

Active substance
protein supplements and resistance exercise training
What this could lead to
If it works, this could give bariatric surgery patients a simple way to keep their muscle mass while losing fat, improving long-term health.
What could go wrong
This is a relatively small, early-stage trial. The extra protein and exercise may not prevent muscle loss for everyone, and some people may find the program hard to stick with.

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 400 people

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

Started

Jun 2025

Expected to finish

Dec 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 years and older

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: * A scheduled metabolic-bariatric surgery (i.e. RYGB or Sleeve Gastrectomy) * Participation in the NOK care program * Able to understand and perform the study procedures Exclusion Criteria: * Allergic or sensitive for milk proteins, or lactose intolerant * Diagnosed renal insufficiency * Diagnosed intestinal diseases influencing the uptake of protein (i.e. active inflammatory bowel disease

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Conditions

The condition(s) this trial relates to.

obesity disorder

As listed by the trial registrant

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

Bariatric surgery Fat free mass

How to take part

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

  1. The places running it

    2 sites. 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

  • Nederlandse Obesitas Kliniek

    NOT_YET_RECRUITING

    Amsterdam, 1043 DS, Netherlands

  • Nederlandse Obesitas Kliniek

    RECRUITING

    Nieuwegein, 3431, Netherlands

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