RecruitingNot Applicable

Time-Restricted Eating After Bariatric Surgery

Turkey (Türkiye)40 participantsStarted 2025-07-12

Plain-language summary

This study aims to compare the effects of time-restricted eating (TRE, 16/8) in adults with obesity who have and have not undergone bariatric surgery (BS). The study will include adults aged 18-65 years: those with obesity who have not undergone BS, and those who have experienced insufficient weight loss (IWL) or weight regain (WR) following BS. Both groups will follow a 16:8 time-restricted eating protocol for 6 weeks, with an 8-hour eating window recommended between 10:00 AM and 6:00 PM, though participants may adjust to other 16-hour fasting windows. Participants will be evaluated before and after the intervention in terms of anthropometric measurements, biochemical parameters, and dietary habits. The study is being conducted at a private hospital in Bursa, Turkey, and is planned to be completed with a total of 40 participants (20 per group).

Who can participate

Age range

18 Years – 65 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

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

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Body Weight

Timeframe: Baseline and 6 weeks

Body Mass Index (BMI)

Timeframe: Baseline and 6 weeks

Body Fat Mass

Timeframe: Baseline and 6 weeks

Muscle Mass

Timeframe: Baseline and 6 weeks

Waist Circumference

Timeframe: Baseline and 6 weeks

Hip Circumference

Timeframe: Baseline and 6 weeks

Percentage of Excess Weight Loss (%EWL)

Timeframe: Baseline and 6 weeks

Percentage of Total Weight Loss (%TWL)

Timeframe: Baseline and 6 weeks

Trial details

NCT IDNCT07672821

SponsorMedipol University

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2026-06

Contact for this trial

Seher Şen, Assistant Professor

+905393919700 seherdalli@gmail.com

View on ClinicalTrials.gov More Obesity & Overweight trials

Plain-language summary

Who can participate

Age range

18 Years – 65 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

What they're measuring

Body Weight

Timeframe: Baseline and 6 weeks

Body Mass Index (BMI)

Timeframe: Baseline and 6 weeks

Body Fat Mass

Timeframe: Baseline and 6 weeks

Muscle Mass

Timeframe: Baseline and 6 weeks

Waist Circumference

Timeframe: Baseline and 6 weeks

Hip Circumference

Timeframe: Baseline and 6 weeks

Percentage of Excess Weight Loss (%EWL)

Timeframe: Baseline and 6 weeks

Percentage of Total Weight Loss (%TWL)

Timeframe: Baseline and 6 weeks