Over the last years, obesity has become a public health problem, both by the growing number of individuals affected and by the comorbidities related to this disorder. The evaluation of quality of life has become fundamental for making the decision about types of treatment. Objectives: analyze quality of life in two groups of patients: those with obesity class II and III, candidates for bariatric surgery, and patients already submitted to surgical treatment of obesity. The WHOQOL-Bref questionnaire was used. The general characteristics of the preoperative group were meanage of 38.68±9.43 years; 85 women and 19 men; mean weight of 126.64± 23.01 kg, and mean BMI of 47.41±7.98 kg/m². The general characteristics of the postoperative group were mean age of 40.33±9.38 years; 46 women and 9 men; mean weight of 72.14±14.53 kg, and mean BMI of 27.53±4.05kg/m². The results showed that in the preoperative group, the perception of quality of life, health satisfaction (HS/Q2), and the physical domain (PhyD) require improvement, whereas the psychological domain (PsD), social relationships (SR), and the environment are regular. In the postoperative group, Q1, Q2, PhyD, PsD, and SR are classified as good, and environment is classified as regular. When compared to the means and scores, there is a statistically significant difference between the groups in all variables studied. In all criteria considered, there was improvement in the quality of life conditions of the population studied. Therefore, the improvements generated by bariatric surgery on health conditions of the population allowed improvements in quality of life of the patients.
