Most people treated with metabolic and bariatric surgery regain weight.

20 percent of patients may regain weight, even if just a bit (approximately 5% of the weight that they have lost), about two years after their surgery. In this period, regaining weight means just regaining a few kg, not reverting back to the previous weight. Since the mechanisms of action of the surgery are still active, this condition can be eliminated with the elimination of the mistakes made in a very short time. The biggest mistake made by patients is that they stop being followed up, and do not get enough dietician and psychologist support, with the thought that they have already gotten rid of obesity with surgery. Sometimes surgical teams make a mistake by withholding dietician and psychologist support for patients. However, scientific studies involving long-term follow up periods have sown that most bariatric surgery patients have achieved and maintained considerable weight-loss. ‘Successful weight loss’ is defined as weight loss equal to or greater than 50% of the excess body weight. Successful results are usually determined not only by weight loss but also by the improvement in the patient’s quality of life as well as the recovery from comorbidities. Meeting the patient’s post-operative expectations is the indication of success, as well. The possibilities of reverting back to the previous condition and the need for a new surgery after stomach reduction and gastric bypass operations is 5-10%, although there is no statistical difference.