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Renal transplant is the only curative treatment for end-stage renal disease. As diabetes and obesity are the major causes of graft failure and post-transplant complication, it is important to manage obesity in patients with renal transplant. Herein, we report a case of a morbidly obese renal-transplant patient with poorly controlled diabetes who received bariatric surgery. A 34-year-old obese Taiwanese man with type 2 diabetes had end-stage renal disease that had progressed since 2008, when he had commenced hemodialysis (January 2008) and had a renal transplant (July 2008). Because of persistent obesity and poorly controlled diabetes, he received LRYGB at Chiayi Christian hospital on 18 August 2010. In the month that followed, he lost 10 kg. His serum creatinine decreased to 1.11 mg/dL (1.4 mg/dL, preoperative) and his hemoglobin A1c decreased to 8.5% (10.4%, preoperative). These results indicate that, in obese renal transplant patients, LRYGB may be employed to treat obesity, control diabetes and stabilize or improve the renal function.