Soheilipour F, Ebrahimian M, Pishgahroudsari M, et al. - This study was undertaken to investigate zinc deficiency among morbidly obese patients before and following different types of bariatric surgical procedures. Researchers conducted a retrospective cohort study including a total of 413 morbidly obese patients (body mass index (BMI) ≥ 40 kg/m2 or BMI ≥ 35 kg/m2 with a complication or risk factor, e.g., diabetes mellitus) who received bariatric surgery, aged between 18 and 65 years old, and had a negative history of active consumption of alcohol and illicit drugs. Individuals were allocated into three groups of bariatric surgeries: mini-gastric bypass, Roux-en-Y gastric bypass, and sleeve gastrectom. The study found a high prevalence of preoperative zinc deficiency among morbidly obese patients who had undergone bariatric surgery, which elevated during the postoperative periods. There is a need to evaluate zinc serum levels and prescribe zinc supplements before the bariatric operation to alleviate the prevalence of zinc deficiency after the operation.