The present article discusses the perioperative management issues in patients with frailty and other geriatric syndromes focusing mainly on the prevention and correction of malnutrition, ESPEN practical guidelines: Clinical Nutrition in cancer. The concept of prehabilitation is described — a multimodal strategy that is implemented from the moment of diagnosis to surgical treatment, aimed at enhancing postoperative outcomes, which elements have a synergistic effect. The clinical case of 62-year-old female patient prehabilitation with a long-term underweight, prefrailty, sarcopenia, osteoporosis and developed because of a transverse colon tumor malnutrition syndrome is given.