Gastro-Intestinal Digestion and Physiology After Bariatric Surgery

Recruiting now

Conditions studied: Bariatric Surgery, Roux-en Y Gastric Bypass, Sleeve Gastrectomy, Obesity & Overweight

In brief

The goal of this clinical trial is to characterize gastrointestinal digestion and physiology in patients after bariatric surgery, or people living with obesity. The main question it aims to answer is: what is the status of gastrointestinal digestion and physiology after bariatric surgery? Participants will have two study visits: 1) participants will undergo collection of gastrointestinal samples and 2) participants will ingest an ingestible capsule that measures multiple physiological parameters along the gastrointestinal tract.

Key facts

Study ID

NCT07286968

Run by

Universitaire Ziekenhuizen KU Leuven

People needed

51

Starts

2026-01-10

Expected to finish

2027-07-01

Last updated by the study team

2026-01-20

Who can join

Age: 18 and older, up to 65. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Participants eligible for inclusion in this Investigation have to meet all of the following criteria:
• Voluntary written informed consent of the participant has been obtained prior to any screening procedures
• Age: 18-65 years
• Specific inclusion criteria for the different patient populations:
• Patients with obesity:
• Body Mass Index: > 30 kg/m2
• Patients after bariatric surgery:
• Surgery: at least one year after Roux-en-Y gastric bypass or sleeve gastrectomy

You may not qualify if…

• Participants eligible for this Investigation must not meet any of the following criteria:
• Patient has history of more than one bariatric surgery
• Patient has a waist circumference > 125.6 cm
• Patient had gastrointestinal surgery in the past three months
• Patient has a pacemaker, defibrillator, infusion pump, or other portable or implanted electromedical device
• Patient had frequent exposure to X-rays in the past year
• Patient has swallowing disorders, among others: dysphagia for food or pills, any oropharyngeal or oesophageal stricture, anxiety or functional abnormality
• Patient has Crohn's disease or Diverticulitis
• Patient has gastrointestinal strictures, fistulas or physiological/mechanical obstructions
• Patient has gastric bezoar
• Patient has a history of complex bowel resection or known abdominal adhesions
• Patient has short bowel syndrome or ostomy
• Patient has currently ongoing infections
• Patient is planned to undergo usage of rectal foam/enema or treatment with adjuvant chemotherapy or radiotherapy
• Patient is currently on parenteral diet
• Patient is planned to undergo MRI procedure during usage of the wireless capsule
• Patient is working in a professional healthcare facility (e.g. hospital, dental office, emergency room), military area (e.g. submarine, near radar installation), or heavy industrial area (e.g. power plants, automotive, mining, refineries) during the duration of the clinical investigation
• Patient is pregnant, breastfeeding, actively trying to get pregnant or had recent childbirth in last 6 months
• Patient cannot discontinue medication that affects gastrointestinal transit time and/or pH for at least 3 days before and during the study (and 4 weeks for weekly/long-acting GLP-1 analogues such as Saxenda, Ozempic, Wegovy, Mounjaro). This includes opioids (e.g., morphine, codeine), proton pump inhibitors (e.g., omeprazole, esomeprazole, pantoprazole), H2-receptor antagonists (e.g., cimetidine, famotidine), antacids, sucralfate, prokinetics (e.g., domperidone, metoclopramide), antidiarrheal agents (e.g., loperamide), antibiotics, probiotics and prebiotics.
• Any disorder, which in the investigator's opinion might jeopardise participant's safety or compliance with the CIP.

Where it is running

• Universitaire Ziekenhuizen KU Leuven — Leuven, Netherlands (enrolling)

Full record on ClinicalTrials.gov

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