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1,000 patients to be studied for 2 years after bariatric surgery

NCT ID NCT04634591

Knowledge-focused Sponsor: Medical University of Bialystok 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 study follows 1,000 people who are having weight-loss (bariatric) surgery. Researchers will measure changes in weight, body fat, blood sugar, cholesterol, and other health markers before surgery and at several follow-up visits over two years. The goal is to better understand how bariatric surgery improves obesity-related conditions like diabetes and metabolic syndrome.

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.

Participants

About 1,000 people

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

Started

Sep 2015

Expected to finish

Dec 2026

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.

Who is studied

In Bialystok Bariatric Surgery Study (BBSS), we observe a cohort study of patients who undergo bariatric surgery in the First Clinical Department of General and Endocrine Surgery of the Medical University of Bialystok. This center performs several types of bariatric surgery including Roux-en-Y gastric bypass (RYGB), adjustable gastric banding (AGB), and sleeve gastrectomy (SG) in patients referred to the clinic by general practitioners and endocrinologists and who were qualified for the surgery according to the clinical physicians. Only patients who agreed to participate in the research project, specified in detail during written and oral patients consent, are included. Moreover, the study population consists of the group of obese patients who do not undergo the surgery and are followed-up without the surgical intervention and the non-obese control group of patients without obesity.

Ages

18 years and older

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: * BMI ≥ 40 kg/m2, or BMI ≥ 35 and at least one or more obesity-related co-morbidities such as type 2 diabetes (T2D), hypertension, sleep apnea and other respiratory disorders, non-alcoholic fatty liver disease, osteoarthritis, lipid abnormalities, gastrointestinal disorders, or heart disease. * Inability to achieve a healthy weight loss sustained for a period of time with prior weight loss efforts * Patient consent for participation in research project * Willingness in participation in follow-up visits Exclusion Criteria: * substance abuse, * uncontrolled psychiatric illness * expected lack of compliance * advanced-stage cancer Non-obese control group: * BMI \<30

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Conditions

The condition(s) this trial relates to.

abdominal obesity-metabolic syndrome diabetes mellitus Dyslipidemias hyperlipidemia inherited lipid metabolism disorder metabolic syndrome X Obesity obesity disorder prediabetes syndrome

As listed by the trial registrant

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

Diabetes mellitus Dyslipidemias Metabolic syndrome Obesity Prediabetes

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

  • Clinical Research Centre, Medical University of Bialystok

    RECRUITING

    Bialystok, Podlaskie Voivodeship, 15-276, Poland

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