Several studies have compared different Roux limb lengths in primary bariatric surgery. It seems to be that long limb RYGB (150cm), especially in patients with BMI > 50 kg/m2, confers at least better short-term weight loss without nutritional consequences. Conversely, other investigators have not found any clinically significant difference in weight loss with increasing Roux limb lengths, especially in patients with BMI < 50 kg/m2 23-26. The following are the main investigators that have increased the malabsorptive component of the failed proximal gastric bypass as a revisional strategy: