This is a retrospective cohort study. The sample size of our study includes one hundred case older than 18 years of age and underwent RYGB surgical treatment during the period from 2014 to 2019 and paired severely overweight controls who had no longer gone through bariatric surgery. Patients having BMI (Body Mass Index) much lower than 35 (calculated as the weight (kilograms) / length2 (meters)), a base line diagnosis taken into consideration a medical exclusion for surgical treatment, died in one year of surgical operation and missed statistics at scientific information had been excluded from the study. Data was collected taking in to account each patient history (age, sex, length, weight, BMI, occupation, marital status, and comorbidities) and weight record in every visit from measurements statistics. Outcomes: The primary final results of the study was the weight-change percentage at follow-up in comparison with baseline one. The secondary effects including the clinical events after surgery, micronutrient levels, incidence of diabetes, hypertension, and dyslipidemia.
