Malnutrition in adults usually manifests itself in appearance and mental status, with patients experiencing loss of hair luster, dry skin, forgetfulness, irritability, and low blood sugar. In the case of women, symptoms such as menstrual disorders and amenorrhea may also occur. Adult malnutrition, the first appearance will be hair loss of normal luster, dry, and thinning. The skin is dry, rough and hyperpigmented, and the nails are pale and coarsened. Adults suffering from malnutrition also show irritability and forgetfulness in their mental state, as well as lack of concentration and insomnia. When there is a lack of sugar in the body due to malnutrition, symptoms of hypoglycemia and weakness in the limbs may also occur. In the case of female patients, the lack of protein due to malnutrition and the lack of raw materials for sex hormones can cause menstrual disorders, amenorrhea and other symptoms. Malnutrition in adults is usually caused by excessive weight loss, unbalanced diet, and chronic wasting diseases such as diabetes. It is recommended to eat more high protein foods such as eggs, lean meat and dairy, as well as more fresh fruits and vegetables to replenish vitamins. If the symptoms do not improve after improving the lifestyle habits, it is recommended to go to the hospital in time for examination and standardized treatment under the guidance of the doctor.