<qa>  What is the purpose of this study?The purpose of this study is to investigate the use of a high-arginine protein supplement prior to surgery for patients undergoing radical cystectomy for treatment of bladder cancer. As many as 50 of patients who undergo radical cystectomy experience a postoperative complication, and poor preoperative nutritional status is known to increase the risk of complications. Preoperative use of a high-arginine protein shake has been shown to reduce the risk of postoperative complications for patients undergoing surgery for colon cancer, and this study seeks to determine whether this is also true for patients undergoing radical cystectomy for bladder cancer. 