Bariatric surgery results in severe obese patients have been reviewed in the Azerbaijani population. The study involved results of the research performed with 119 severely obese patients [average age 40 19; average body mass index (BMI) 59.95+20.25 kg/m²] who undergone bariatric surgery, com- pared post-operative complications by different technical modification, and observed fatty liver dis- ease dynamics by examining BMI, diabetes, hypertension before operation and 1, 3, 6 and 12 months after operation. During the first 6 months, 109 (92.6%) patients who undergone laparoscopic sleeve gastrectomy (LSG) achieved average weight loss of 39.5+11.5 kg. In 10 (8.4%) patients who undergone gastric bypass surgery [2 (1.68%) patients - Ru Y gastric bypass, 6 (5.0%) patients - mini gastric by- pass, 1 (0.84%) patient - sleeve + Ru Y gastric bypass and 1 (0.84%) patient - sleeve+mini gastric by- pass], this indicator was 46±14 kg, and during the second 6 months effective weight loss was observed as in previous months, which equaled to 33.5+8.5 kg. Annual weight loss indicator was 71.5+23.5 kg for all surgeries. According to our study it can be concluded that unlike other methods, satisfactory weight loss in severely obese patients and consequently, improvement in comorbidities observed after laparoscopic sleeve gastrectomy (LSG) make this method more reliable.