TITLE:
Dumping Syndrome after Bariatric Surgery: A Systematic Review of Current Evidence
AUTHORS:
Gregorio Jurado Delgado, Natalia Andrea Jurado Rúa, Alejandra Lozano Lozano, Jhonny José Pacheco Polo, Vladimir Alejandro Balza Mancipe, Gabriela Palmett Gonzalez Rubio, Salma Nasrala Nieves, Johana Patricia Estrada Espinoza, Nazly Eydith Peinado Torres, Gustavo Alberto Gutiérrez-Barros
KEYWORDS:
Dumping Syndrome, Bariatric Surgery, Roux-en-Y Gastric Bypass, Post Bariatric Hypoglycemia, Postprandial Hypoglycemia, Continuous Glucose Monitoring, Endoscopic Treatment
JOURNAL NAME:
Journal of Biosciences and Medicines,
Vol.14 No.11,
November
4,
2026
ABSTRACT: Importance: Dumping syndrome is a clinically relevant complication of bariatric surgery with gastrointestinal, vasomotor, and glycemic manifestations. Variability in definitions, diagnostic methods, and outcomes complicates estimates of its frequency and the establishment of standardized treatment. Objective: To synthesize contemporary evidence on the definition, pathophysiology, clinical manifestations, diagnosis, and treatment of dumping syndrome after bariatric surgery, emphasizing the distinction between early dumping and post bariatric hypoglycemia. Evidence Review: PubMed was systematically searched for original studies published from 2017 through 2026. Studies of patients undergoing bariatric procedures were eligible if they assessed pathophysiologic mechanisms, diagnostic criteria, clinical manifestations, or nutritional, pharmacologic, technology-assisted, endoscopic, or surgical interventions. The narrative synthesis included 47 original research reports. Five reviews, consensus statements, or clinical guidelines were used exclusively to contextualize the evidence and were not counted among the included studies. Heterogeneity in populations, definitions, and outcomes required narrative synthesis. Findings: Early dumping typically occurs within 1 hour after food intake and reflects rapid transit of hyperosmolar contents, intravascular fluid shifts, and gastrointestinal mediator release. Postbariatric hypoglycemia typically develops 2 to 4 hours after meals and involves rapid glucose absorption, excessive incretion, and hyperinsulinemia. Confirmed postbariatric hypoglycemia requires Whipple’s triad: compatible symptoms with concurrent blood glucose below 54 mg/dL (3.0 mmol/L) and symptom resolution after glucose correction, following exclusion of alternative causes. Mixed-meal tolerance testing has been used to characterize postprandial responses in research, and continuous glucose monitoring can reveal glycemic variability and sensor-detected glucose lows but does not replace biochemical confirmation. Nutritional modification is first-line treatment. Acarbose has the most consistent evidence among conventional medications, whereas avexitide and dasiglucagon have shown promise in short-duration trials. Continuous glucose monitoring may reduce sensor-recorded exposure to low glucose concentrations and support self-management. For refractory symptoms with a dilated gastrojejunal anastomosis, endoscopic outlet reduction is less invasive than surgery. Gastric bypass reversal carries substantial morbidity and should be reserved for carefully selected patients. Conclusions and Relevance: Dumping syndrome after bariatric surgery is heterogeneous, and management should be tailored to the predominant phenotype. Evidence supports a stepwise approach integrating nutritional intervention, individualized pharmacologic therapy, glucose-monitoring technologies, and endoscopic procedures before surgical reversal. Multicenter studies using standardized definitions and outcomes are needed to establish comparative effectiveness and durability.