Adults should consume about 60 to 80g of protein per day, but the amount of protein needed per day varies depending on age group as well as gender. Lack of protein may lead to malnutrition and other symptoms. Protein is the material basis of life and is an important component of all cells and tissues in the human body. Protein is mainly composed of carbon, hydrogen, oxygen and nitrogen and contains phosphorus, sulfur, iron, zinc, copper and manganese. Adults who consume about 60 to 80g of protein per day can effectively repair important tissues in the human body, as well as build tissues, maintain normal metabolism of the body, and provide essential amino acids. When the body lacks protein, there will be malnutrition, low immunity, osteoporosis, and the skin is difficult to recover from external strains. Lack of protein can eat aquatic products, such as fish, shrimp, crab shellfish; eggs, such as eggs, duck eggs, goose eggs, etc.; dairy products, such as milk, yogurt, horse’s milk, goat’s milk and so on. Lack of protein should be timely supplementation, but not blind supplementation, should be under the guidance of the doctor moderate supplementation.