Obesity is a public health problem that has been increasing the number of bariatric surgeries (BS). Glycemic indicators such as glycated hemoglobin (HbA1c) and glucose may be affected by BS and are associated with the incidence of Diabetes Mellitus II. This study aims to analyze the repercussions of BS on weight and biochemical profile of patients in two periods: preoperative and 6 months after BS.


The weight loss and HbA1c and glucose contents were extracted from a database of patients submitted to BS. The sample consisted of 120 patients (60% women and 40% men) with a mean age of 41 (+11.30) years. The results were compared by Tukey test at 5% significance through software R..


Different behaviors were observed in the variables before and after BS. In the preoperative evaluation, the mean weight of the patients was 117.97 kg (+22.63 kg) and in the postoperative was 74.67 kg (+14.56 kg). Regarding the biochemical profile, there was a significant difference between the pre and postoperative values. The highest values ​​of glucose and HbA1c were observed in the preoperative period, with a mean of 97.3 mg dL-1 (+20.92 mg dL-1) and 5.81% (+1.08%), respectively, and statistically differed from the postoperative period with averages of 84.43 mg dL-1 (+12.76 mg dL-1) and 5.29% (+0.61%), respectively.


BS reduced glucose and HbA1c ​​in patients submitted to BS, which may represent the reduction of risks of diseases. Therefore, the monitoring of these parameters in the late postoperative period is justified.