Patients lose more than pounds and inches after bariatric surgery. Gastric bypass and gastric banding, the two most commonly performed procedures, have been shown to help resolve diabetes, eliminate sleep apnea and alleviate hypertension, among other potential secondary benefits. That evolution of care now makes bariatric surgery less a mechanical treatment for weight loss and more a metabolic therapy for the morbidly obese. Here's where the specialty stands now and where it may be heading.