Semaglutide rescues weight regain after sleeve gastrectomy in adolescents by boosting declining GLP-1 levels | Research

The takeaway

In 264 adolescents after sleeve gastrectomy, GLP-1 and GIP surges attenuated over time, correlating with weight regain in 62 patients. Semaglutide increased excess weight loss from 34% to 68% in the weight-regain group.

%EWL: 34% → 68% with semaglutide
Semaglutide doubled excess weight loss in adolescents experiencing weight regain after sleeve gastrectomy

What the researchers found

264 adolescents; weight: 133→87 kg by year 2; %EWL peaked at 68%, declined to 63% by year 5. GLP-1/GIP attenuated over time. 62 patients with WR: semaglutide increased %EWL from 34% to 68% over 1 year. WR patients had larger gastric volumes and more pronounced incretin attenuation.

Why it matters

Weight regain after bariatric surgery is a growing concern, especially in adolescents who face decades of metabolic risk. Understanding that declining incretin hormones drive regain—and that GLP-1 drugs can reverse it—provides a targeted rescue strategy.

How the study worked

Retrospective cohort of 264 adolescents (mean age 15, 74% female) with standardized LSG, 5-year annual follow-up with weight, BMI, GLP-1, GIP measurements. WR patients (n=62) received semaglutide from year 3.

What this study cannot tell us

Retrospective design. Semaglutide given without randomization or control group in WR patients. Small WR subgroup (n=62). Duration of semaglutide benefit beyond 1 year unknown.

How to read the evidence

Large retrospective cohort with 5-year follow-up. Semaglutide intervention was not randomized. Provides strong observational evidence for incretin-based rescue therapy.

When this study was published

Published in 2025; addresses the growing issue of post-bariatric weight regain in adolescents.

The bigger picture

This study bridges bariatric surgery and GLP-1 pharmacotherapy, showing they can work together. As both approaches become more common in adolescents, combination strategies may prevent the long-term failures that plague bariatric surgery alone.

Questions still open

Should semaglutide be routinely prescribed to prevent post-bariatric weight regain?
Is semaglutide needed indefinitely or just during the incretin-declining window?
Could pre-emptive GLP-1 therapy prevent weight regain altogether?

Common questions

Why do some teens regain weight after sleeve gastrectomy?

After surgery, the stomach produces higher levels of GLP-1 and GIP hormones that suppress appetite and improve metabolism. Over time, these hormone surges diminish, and some patients—about 24% in this study—regain significant weight. Those with the biggest hormone declines and larger remaining stomach volumes were most affected.

Can semaglutide help after bariatric surgery?

Yes. In this study, semaglutide doubled the excess weight loss (from 34% to 68%) in adolescents who regained weight after sleeve gastrectomy. It essentially supplements the declining natural GLP-1 response, restoring the metabolic benefits the surgery initially provided.

Read the original research

GLP-1 and GIP Changes after Sleeve Gastrectomy and Weight Regain in Adolescents. Do we need a Boost?

Obesity surgery, 35(10), 4087-4102

View on PubMed ↗Publisher’s paper ↗

Citation

Shehata, Mohamed; Elhaddad, Ahmed; Mansour, Mohamed; Shehata, Sherif; El Attar, Ashraf. (2025). GLP-1 and GIP Changes after Sleeve Gastrectomy and Weight Regain in Adolescents. Do we need a Boost?. Obesity surgery, 35(10), 4087-4102. https://doi.org/10.1007/s11695-025-08168-x