 Subjects will drink four protein shakes Nestle Impact AR per day for 5-7 days prior to radical cystectomy. Shakes will be provided to patients free of charge. On the date of surgery, subjects will turn in a log of shake consumption. Surgery will then proceed in typical fashion, and no changes will be made to surgery or postoperative care. Clinical outcomes for the first 90 postoperative days will be collected. Patient outcomes will be compared to those of contemporary controls who do not undergo supervised nutritional supplementation. Primary study outcome is to assess safety, tolerability and adherence to supplementation regimen. Secondary outcomes include differences in complication rates and length of postoperative hospital stay between groups. 