Bariatric surgery appears efficacious compared to st and ard care in reducing BMI .
Weight losses are greatest with diversionary procedures , intermediate with diversionary/restrictive procedures , and lowest with those that are purely restrictive .
Compared with Roux-en-Y gastric bypass , adjustable gastric b and ing has lower weight loss efficacy , but also leads to fewer serious adverse effects
Clinical trial of jejunoileal and gastric bypass for the treatment of morbid obesity: four-year progress report.
The present status of 38 patients comprising a clinical trial of jejunoileal and gastric bypass for the treatment of morbid obesity , begun four years ago at North Carolina Memorial Hospital , is reported . Weight loss was greater in patients treated by jejunoileal bypass  than those treated by gastric bypass .  The poorer weight loss noted in the  gastric bypass patients is associated with an excessively large proximal gastric pouch , which had characterized the 19  gastric bypass operations done prior to May 1977 . The weight loss achieved with the current version of the gastric bypass , a smaller proximal gastric pouch , is comparable to that achieved with jejunoileal bypass . The objective and subjective sequelae and complications of jejunoileal bypass are more common and more serious than those of gastric bypass . Gastric bypass is the better operation for the treatment of morbid obesity
Bariatric surgery appears efficacious compared to st and ard care in reducing BMI .
Weight losses are greatest with diversionary procedures , intermediate with diversionary/restrictive procedures , and lowest with those that are purely restrictive .
Compared with Roux-en-Y gastric bypass , adjustable gastric b and ing has lower weight loss efficacy , but also leads to fewer serious adverse effects