Background: After cardiac valve replacement surgery, there is a pronounced inflammatory response and heightened metabolic rate. The adequacy of nutrition may affect immune modulation, recovery parameters, and quality of life (QOL), but there is a paucity of combined prospective data. Objective: To assess the effect of postoperative nutritional status on inflammation, recovery, and QOL in patients undergoing cardiac valve replacement surgery. Materials and Methods: A prospective observational stu