Johnson et al have demonstrated an increased incidence of postoperative complications from 55% to 67% for patients with nutritional deficiency portrayed by low serum albumin level. Similarly yet in gynecological cancers, hypoalbuminemia was an independent surrogate for adverse postoperative events. Therefore, it has been highly recommended to implicate innovative nutritional interventions for optimizing the outcome after radical cystectomy.What is worth mention is that the active ingredients of immune diet were considerably the same across studies on different cancers, and principally including arginine, omega-3 fatty acids, and glutamine which have been proved to ameliorate the inflammatory and stress response of the body to surgery, and consequently, minimizing the postoperative morbidity. It is also particularly important to note that oral diet had been valued over parenteral injections concerning efficacy and safety.