Scientific evidence consubstantiates the need to integrate nutrition into the continuum of cancer care, given the prominent clinical benefit for improved efficacy of oncologic treatments and disease prognosis. State-of-the-art and outcome driven cancer care, requires constant, cohesive and updated nutritional therapy for each patient. Implementing clinical nutrition guidelines in the oncology setting will strongly benefit the patient, thus posing an ethical responsibility for health care professionals involved in patient treatment.