Factors influencing body weight one year after bariatric surgery.

The significant outcome of bariatric surgery (BS) is weight loss, which may be affected by many factors, such as initial body weight before surgery, sex, and dietary intake. Moreover, rapid weight loss is associated with an increased incidence of postsurgical cholelithiasis. To investigate the observed weight loss outcomes during the first year after BS, we investigated the factors that may influence weight loss and to detect the efficacy of prophylactic ursodeoxycholic acid against gallstone formation.