1. Malnourished adults will lose weight at first, subcutaneous fat will gradually decrease or even disappear, and patients' limbs may contract.

2. After the symptoms of malnutrition in adults get worse, there will be symptoms such as dry skin, pallor, facial skin contraction and relaxation, dry hair, etc., but the average adult may not think that he is malnourished, but if he finds these symptoms, he must go to the hospital in time.

3, there will be many symptoms of malnutrition, if it is mild malnutrition, normal mental state, serious mental malaise, hair loss, sparse hair, no appetite, do not want to eat, diarrhea and constipation will occur to varying degrees.