The physiological functions of protein in the human body are as follows: First, to construct the human body, protein is the material basis of all life, an important component of the body’s cells, and the main raw material for the renewal and repair of human tissues. Every tissue of the human body, such as hair, skin, muscle, bone, internal organs, etc. is composed of protein, so that protein is very important for human growth and development. Second, the transport of carriers, to maintain the normal metabolism of the body, and the transport of various types of substances in the body. Carrier protein, is essential to maintain the normal life activities of the human body. Third, to maintain the osmotic pressure balance in the body, as well as the balance of body fluids. IV. Maintain the acid-base balance of body fluids. V. Involved in the immunity of antibodies, the protein can strengthen the immunity of leukocytes, macrophages and other cells. VI. Various enzymes that constitute the essential catalytic and regulatory functions of the body. VII. Energy substances, proteins are to provide energy for life activities.