Sustained weight-maintaining effects after bariatric surgeries are questioned. Substantial weight regain 3 years post-bariatric surgery is affecting approximately 80% of patients. Some of the identified factors include undiagnosed or under-treated binge-eating and other eating disorders, minimal lifestyle changes after the surgery and lack of exercise.
Almantas Maleckas et al. Weight regain after gastric bypass: etiology and treatment options. Gland Surg. 2016 Dec; 5(6): 617–624.