Cancer patients are a high risk group for malnutrition.The decreased intake,impaired absorption,abnormal utiliza-tion,increased consumption and increased demand are the main causes of malnutrition in oncology patients.Malnutrition can lead to adverse outcomes such as reduced tolerance to anti-cancer therapy,decreased quality of life for patients,shortened survival time,and increased medical costs.Therefore,standardized nutritional therapy for oncology patients should become an important part of compre-hensive cancer treatment and be carried out through the entire life cycle of cancer patients.This article describes the indications,tim-ing and duration of nutritional therapy,treatment goals and the five-step therapeutic approaches,the energy and protein requirements of oncology patients,the characteristics of tumor-specific nutritional formulas,and evaluation of the effectiveness of nutritional thera-py,in order to provide guidance for clinical nutritional therapy for cancer patients.
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