Time-restricted eating after bariatric surgery
Official title: Comparison of Time-Restricted Intermittent Fasting Diet in Individuals With and Without Bariatric Surgery
Run by Medipol University · NCT07672821 · Data updated 2026-11-12
This study tests whether a 16:8 eating window helps adults with obesity, including those who have had bariatric surgery, see weight or metabolic improvements.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years to 65 Years |
| Sex | All |
| Enrollment | 40 (estimated) |
| Sponsor | Medipol University Academic / other |
| Locations | 2 sites (Bursa, Lütfen Seçiniz. and 1 other locations) |
| Status | Recruiting |
| Started | July 12, 2025 |
| Main results expected | June 2026 |
| Study ends | July 12, 2026 |
| Registry record updated | June 29, 2026 |
| Trial ID | NCT07672821 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults 18-65 with obesity, including those who have not had bariatric surgery and those with IWL or WR after bariatric surgery.
✕Probably not a fit
Patients who do not respond to TRE or have contraindications to time-restricted eating may not experience weight or metabolic benefits.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This prospective, controlled study compares 16:8 time-restricted eating in two groups of adults with obesity: those who have not had bariatric surgery and those who have had bariatric surgery but with weight regain or insufficient weight loss. Participants will follow an 8-hour eating window (10:00 AM–6:00 PM, adjustable) for 6 weeks, with face-to-face visits at baseline, day 15, day 30, and day 45 and weekly check-ins. Outcomes include anthropometric measurements, biochemical parameters, and dietary intake assessed by 3-day food records and nutrition software. The study is conducted in Bursa, Turkey, at a private hospital, enrolling 40 participants (20 per group). Nutritional guidance aligns with ASMBS guidelines, and analyses will involve standard statistical methods to compare changes between groups.
Why it matters
Potential benefit: If successful, TRE could help people manage weight and metabolic health after bariatric surgery or in obesity without surgery.
How similar studies have gone: Prior research suggests TRE can aid weight loss and metabolic improvements in obesity, but data in post-bariatric populations are limited and this study explores that gap.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Adults aged 18-65 years with obesity who have not undergone bariatric surgery * Adults aged 18-65 years with obesity who have undergone bariatric surgery and experienced insufficient weight loss (IWL) within 18 months post-surgery, -defined as %EWL \<50% at 18 months * Adults aged 18-65 years with obesity who have undergone bariatric surgery and experienced weight regain (WR), defined as \>25% increase in %EWL from the lowest recorded weight Exclusion Criteria: * Pregnant or breastfeeding individuals * Acute illness, active infection, or comorbid conditions limiting treatment efficacy and safety, including: cancer, type 1 diabetes, renal or hepatic failure, recent stroke or myocardial infarction, nephrolithiasis, drug or alcohol abuse, eating disorders, severe depression or other psychiatric disorders, inflammatory bowel disease (IBD), neoplasia, arrhythmic heart disease, heart failure, respiratory failure, or corticosteroid therapy * Professional athletes
Where it's running
-
Nev Sağlık Grubu
Bursa, Lütfen Seçiniz., Turkey (Türkiye) Recruiting -
Nev Sağlık Grubu
Bursa, Turkey (Türkiye) Recruiting
Study contacts
- Study coordinator: Seher Şen, Assistant Professor
- Email: seherdalli@gmail.com
- Phone: +905393919700
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.