Methods: We conducted a retrospective case control analysis of the effect of Orlistat in obese patients. We included patients on Orlistat who were enrolled in the MOVE clinic (Managing Overweight/Obesity in Veterans Everywhere) at the Brooklyn VA Hospital, NY from October 2006 to May 2012. Exclusion criteria were pre-existing renal dysfunction, chronic kidney disease, use of drugs with potential nephrotoxicity or the use of Orlistat for less than six months. Patients were provided education and consultation. Consistency in renal function (BUN, Creatinine & eGFR) over one year were analyzed with the intraclass correlation coefficient (ICC). Differences in weight loss were compared between the groups treated with Orlistat to that of a matched control group not on Orlistat using analysis of variance.