BACKGROUND:Obesity is a chronic condition and its clinical and economic consequences are very concerning. Obesity and its co-morbidities were associated with USD 2.1 billion annually costs in the Brazilian Public Health System. According to a National Survey there are 22 million people in Brazil with BMI >30kg/mOBJECTIVES: To describe epidemiology, treatment patterns, resource use and associated costs of morbid obese patients in the list, waiting to receive surgical treatment for surgery in order to quantify the clinic and economic burden of not providing surgical treatment to eligible patients METHODS: Non-interventional, single center, retrospective cohort with medical chart review of 300 patients who met eligibility criteria, having their registry data extracted and outcomes followed-up for up to 12-months post-bariatric-surgery RESULTS: The mean time in the waiting list was 751.76 days. BMI mean at baseline was 46,53 kg/m2 (95% CI 45,67-47,39); 43,78 kg/m2 (95% CI 42,98-44,59) at surgery and  30,91 kg/m2 (95% CI 30,29-31,55) at 12-months follow-up. 195(65%) of patients presented hypertension at baseline, which 92,8% presented improvement/resolution 12-months after surgery. 70(23,3%) presented dyslipidemia, with resolution of 94,3% after 12-months. 55(18,33%) presented diabetes, with resolution of 94,3% after 12-months. 37 (12,33%) patients increased BMI during the wait list., these patients presented lower comorbidities resolution rates compared to patients who maintained or reduced their BMI in the wait list CONCLUSIONS: Analysis demonstrated high comorbidities resolution rates after 12 months of follow up and significant reduction on medications consumption. Patients who increased BMI during the wait list presented lower rates of comorbidities resolution compared to patients who maintained or reduced their BMI in the wait list. Based on the outcomes presented, bariatric surgery is a procedure that can help the Brazilian health system to treat obesity and its co-morbidities