Self-determination of malnutrition can be measured by the following methods: first, if the weight is low, or after a certain amount of food still does not gain weight, relatively little subcutaneous fat or muscle tissue atrophy, are clinical symptoms of malnutrition. Second, malnutrition can also be manifested as weakness, weakness, low immunity, low basal metabolic rate, pallor, low blood pressure, low blood sugar or a series of neurological symptoms, such as dizziness, headache, hair loss, loss of concentration, memory loss, easy to dream and poor sleep quality when resting and sleeping, all belong to the neurological changes of malnutrition. Thirdly, the skeletal muscle system of the body may develop osteoporosis, anemia, and cardiac arrhythmia in the circulatory system, which are all clinical symptoms of malnutrition.