Malnutrition in cancer patients - in both prevalence and degree - depends primarily on tumor stage and site. Preoperative malnutrition in surgical patients is a frequent problem and is associated with prolonged hospital stay, a higher rate of postoperative complications, higher re-admission rates, and a higher incidence of postoperative death. Given the focus on the cancer and its cure, nutrition is often neglected or under-evaluated, and this despite the availability of international guidelines for nutritional care in cancer patients and the evidence that nutritional deterioration negatively affects survival. Inadequate nutritional support for cancer patients should be considered ethically unacceptable; prompt nutritional support must be guaranteed to all cancer patients, as it can have many clinical and economic advantages. Patients undergoing multimodal oncological care are at particular risk of progressive nutritional decline, and it is essential to minimize the nutritional/metabolic impact of oncological treatments and to manage each surgical episode within the context of an enhanced recovery pathway. In Europe, enhanced recovery after surgery (ERAS) and routine nutritional assessment are only partially implemented because of insufficient awareness among health professionals of nutritional problems, a lack of structured collaboration between surgeons and clinical nutrition specialists, old dogmas, and the absence of dedicated resources. Collaboration between opinion leaders dedicated to ERAS from both the European Society of Surgical Oncology (ESSO) and the ERAS Society was born with the aim of promoting nutritional assessment and perioperative nutrition with and without an enhanced recovery program. The goal will be to improve awareness in the surgical oncology community and at institutional level to modify current clinical practice and identify optimal treatment options.