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Background and Objective: Bariatric surgery is the most effective treatment for morbid obesity. The classic procedure, jejunoileal bypass, has many complications. This study was carried out to assess the evaluation of clinical complications in morbid obese patients after modified jejunoileal bypass surgery. Method: This descriptive – analytic study was carried out on 120 morbid obese patients referred for bariatric surgery. A modified jejunoileal bypass was performed in which the defunctionalized organ eliminated by anastomosing its ends to the gall bladder and cecum. Weight loss and clinical complications were recorded after one year follow up. Results: The mean weight and body mass index reduced from 136 kg and 48 kg/m2 before surgery to 83 kg and 29/8 kg/m2 after one year follow up, respectively (P<0.05). Before surgery, articular pain (24.3%), dispana (21.6%), cardiovascular disorders (10.8%), fatty liver (5.4%) and sleep disorder (5.4%) due to obesity were recorded. One year follow up after surgery, articular pain (1.5%) and dispana (1.5%) were seen in patiants. No serious post-operative clinical complication was observed. Conclusion: One year follow up after surgery showed that the modified jejunoileal bypass is very effective in reducing body weight and does not lead to serious complication.

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Background and Objective: Weight regain following bariatric surgery is a significant challenge for this obesity treatment method. This study aimed to identify factors associated with weight regain after bariatric surgeries in obese patients in Gorgan, Iran.
Methods: This longitudinal study included 143 obese individuals (125 women and 18 men) with a mean age of 43.13±9.83 years who underwent bariatric surgery in Gorgan, Iran during 2013-19. Participants were invited to join the study via phone calls. Research variables (type of surgery, blood group, pre-surgery weight, and body mass index [BMI]) were extracted from patient records, and their current weight and waist circumference were measured and recorded. Weight regain was determined based on one of three different criteria: (1) regaining more than 25% of the maximum weight lost post-surgery, (2) regaining more than 10 kg from the minimum weight post-surgery, or (3) an increase of more than 5 BMI units from the lowest BMI post-surgery.
Results: Overall, 33% of individuals experienced weight regain, with 26.6% according to the first definition, 29.4% according to the second definition, and 18.2% according to the third definition. Men had a higher rate of weight regain (P<0.05). Additionally, 93.6% (44 cases) of those with weight regain had abdominal obesity. On average, 79.7% of participants who were 48 months post-bariatric surgery experienced some degree of weight regain. Individuals with a pre-surgery BMI of 50 or higher had a 2.69 times greater chance of weight regain compared to those with BMI lower 50 (P<0.05). The mean weight loss after surgery was significantly higher in individuals who experienced weight regain than those who did not (P<0.05). There was no significant statistical association between weight regain and the type of surgery, age, education level, marital status, or blood group.
Conclusion: Weight regain over time is a reality after bariatric surgery, indicating that this method is not a definitive cure for obesity. Therefore, long-term follow-up for weight control is crucial, especially for individuals with a pre-surgery BMI of 50 or higher or those who experienced significant weight loss post-surgery.