TORe for Weight Regain After Gastric Bypass
An incision-free endoscopic revision option for selected patients who have regained weight after Roux-en-Y gastric bypass.
TORe in Massachusetts
Weight regain after Roux-en-Y gastric bypass is common and can be frustrating. In some patients, weight regain is related in part to stretching of the gastrojejunal anastomosis — the connection between the small stomach pouch and the small intestine. When this outlet becomes enlarged, food may empty more quickly from the pouch, reducing fullness and making weight regain more likely.
Transoral outlet reduction, or TORe, is an endoscopic procedure designed for selected patients with weight regain after Roux-en-Y gastric bypass. It is performed through the mouth using an endoscope and endoscopic suturing, without external incisions.
At Integrated Gastroenterology Consultants, TORe is offered as part of a physician-led weight management program that includes evaluation of anatomy, nutrition, lifestyle, medication options when appropriate, and long-term follow-up.
What is TORe?
TORe stands for transoral outlet reduction. “Transoral” means the procedure is performed through the mouth. “Outlet reduction” refers to reducing the size of the gastrojejunal outlet after gastric bypass.
During TORe, the physician uses an endoscope and suturing device to reduce the size of the outlet and sometimes adjust the pouch anatomy. The goal is to help restore restriction, improve satiety, and support renewed weight loss.
TORe is not a general weight-loss procedure for patients who have not had gastric bypass. It is specifically intended for selected patients with prior Roux-en-Y gastric bypass.
Why weight regain can happen after gastric bypass
Roux-en-Y gastric bypass is an effective bariatric operation, but weight regain can occur over time. Causes may include changes in eating patterns, metabolic adaptation, medication effects, hormonal factors, reduced physical activity, behavioral factors, or anatomic changes.
One anatomic contributor is dilation of the gastrojejunal anastomosis. When the outlet stretches, the pouch may empty more quickly, and patients may feel less restriction than they did earlier after surgery.
TORe addresses this anatomic component. It works best when paired with a comprehensive medical, nutritional, and lifestyle plan.
Who may be a candidate for TORe?
TORe may be considered for patients who:
Previously had Roux-en-Y gastric bypass
Have experienced weight regain or inadequate weight-loss maintenance
Have an enlarged gastrojejunal outlet or anatomy that may respond to endoscopic revision
Want an incision-free alternative to surgical revision
Are willing to participate in structured follow-up after the procedure
TORe may not be appropriate for all patients with weight regain. Some patients may benefit more from medication, nutrition and lifestyle treatment, surgical evaluation, or evaluation for other causes of weight change.
What happens before TORe?
Before TORe, patients typically undergo a detailed evaluation, which may include:
Review of original bariatric surgery history
Weight-loss and weight-regain timeline
Review of eating patterns, medications, and medical conditions
Evaluation for nutritional deficiencies
Assessment of reflux, ulcers, abdominal pain, or other GI symptoms
Upper endoscopy to evaluate pouch and outlet anatomy
Discussion of alternatives, including medical therapy and surgical revision
This evaluation helps determine whether the patient’s anatomy is likely to respond to TORe.
What happens during TORe?
TORe is performed under anesthesia using an upper endoscope. The physician advances the endoscope through the mouth into the gastric pouch and identifies the gastrojejunal outlet. Endoscopic sutures are then placed to reduce the outlet diameter and, in some cases, modify the pouch.
The procedure does not require external incisions. Many patients go home the same day, depending on their health and procedural course.
Recovery after TORe
After TORe, patients follow a staged diet, usually beginning with liquids and gradually advancing according to the care team’s instructions. Temporary symptoms may include nausea, abdominal discomfort, bloating, reflux, or difficulty tolerating certain foods during early recovery.
Long-term follow-up is important. TORe is most effective when combined with nutrition counseling, behavioral support, physical activity planning, and medical management when appropriate.
Expected results after TORe
TORe is intended to help patients regain some of the restrictive effect of gastric bypass when outlet dilation is contributing to weight regain. Published studies support TORe as an endoscopic option for weight regain after Roux-en-Y gastric bypass, including randomized trial evidence and longer-term observational follow-up.
Individual results vary. Weight loss after TORe depends on anatomy, starting weight, time from bypass, dietary patterns, medications, metabolic factors, and follow-up.
TORe vs surgical revision
Surgical revision after gastric bypass can be effective for selected patients, but it can also be technically complex and associated with higher risk than the original operation. TORe offers an incision-free endoscopic alternative for patients whose anatomy is suitable.
TORe is not a replacement for all forms of surgical revision. The best approach depends on anatomy, medical risk, nutritional status, symptoms, and the patient’s goals.
Risks and considerations
TORe is less invasive than surgical revision, but it still has risks. Potential risks include bleeding, infection, abdominal pain, nausea, vomiting, reflux, narrowing of the outlet, need for repeat endoscopy, anesthesia-related complications, or failure to achieve desired weight loss. Serious complications are uncommon but possible.
A consultation is required to discuss candidacy, benefits, risks, alternatives, and expectations.
FAQ for TORe
What does TORe stand for?
TORe stands for transoral outlet reduction.
Who is TORe for?
TORe is for selected patients who previously had Roux-en-Y gastric bypass and later experienced weight regain, particularly when the gastric bypass outlet has stretched.
Is TORe surgery?
No. TORe is performed endoscopically through the mouth, without external incisions. It is still a medical procedure requiring anesthesia and follow-up.
Is TORe the same as ESG?
No. ESG is a primary endoscopic weight-loss procedure for patients who have not necessarily had bariatric surgery. TORe is a revisional endoscopic procedure for selected patients after Roux-en-Y gastric bypass.
How do I know if my gastric bypass outlet is stretched?
An upper endoscopy can evaluate the size of the gastric pouch and gastrojejunal outlet.
How much weight can I lose after TORe?
Results vary. TORe may help support renewed weight loss when outlet dilation is contributing to weight regain, but long-term results depend on anatomy, diet, activity, medications, and follow-up.
Can TORe be combined with weight-loss medications?
Yes, in some cases. Medication therapy may be considered before or after TORe depending on the patient’s medical history and treatment response.
Is TORe covered by insurance?
Coverage varies. Patients should check with their insurer and discuss documentation and cost considerations with the IGIC billing team, who can discuss options such as payment plans.
If you previously had Roux-en-Y gastric bypass and are experiencing weight regain, IGIC can evaluate whether TORe or another weight-management option is appropriate.
Call 978-459-6737 or request a Weight Management Consultation.
Sources:
Thompson CC, Chand B, Chen YK, et al. Endoscopic suturing for transoral outlet reduction increases weight loss after Roux-en-Y gastric bypass surgery. Gastroenterology. 2013;145(1):129-137.e3. doi:10.1053/j.gastro.2013.04.002.
Kumar N, Thompson CC. Transoral outlet reduction for weight regain after gastric bypass: long-term follow-up. Gastrointestinal Endoscopy. 2016.
Jirapinyo P, Kumar N, AlSamman MA, Thompson CC. Five-year outcomes of transoral outlet reduction for the treatment of weight regain after Roux-en-Y gastric bypass. Gastrointestinal Endoscopy. 2020;91(5):1067-1073. doi:10.1016/j.gie.2019.11.044.
Mayo Clinic. The use of transoral outlet reduction endoscopy to manage weight regain after gastric bypass: A comparison of 2 endoscopic techniques. Mayo Clinic; 2021.
Hakiza L, Jirapinyo P, Thompson CC. Transoral Outlet Reduction (TORe) for the Treatment of Weight Regain and Dumping Syndrome After Roux-en-Y Gastric Bypass. Medicina. 2023;59(1):125.
Medically reviewed by: Erik Holzwanger, MD
Last reviewed: 4/30/26
Integrated Gastroenterology Consultants Weight Management & Lifestyle Medicine Center