Association of Preoperative Serum 25-Hydroxyvitamin D with Longitudinal Body Mass Index After Bariatric Surgery-A Mediation Effect of Serum Albumin.

Background: The predictive ability of vitamin D for weight loss after bariatric surgery is not well-characterized. This prospective cohort study assessed the utility of preoperative serum 25-hydroxyvitamin D (25(OH)D) as a predictor of body mass index (BMI) at follow-up after bariatric surgery. Additionally, the mediation role of serum albumin was explored.