Proteins have the functions of enhancing human resistance, physiological regulation, providing energy and transporting nutrients. 1. Enhance human resistance: proteins can constitute antibodies and participate in the body’s function of humoral immunity, the body’s immune cells need proteins to maintain, if the body lacks proteins, it will lead to immune dysfunction, resulting in decreased immunity. 2. Physiological regulation: proteins have biological activity hormone, can form a variety of enzymes needed by the body’s catalytic and regulatory functions, insulin and growth hormone are composed of amino acids, amino acids are raw materials are proteins, for the human body to provide catalytic, to promote the role of food digestion and absorption, to help regulate the growth and development of the mechanism. 3. Provide energy: when the body’s energy consumption, the body’s proteins and fats will automatically decompose, into energy that can be utilized by the body, protein is the main source of energy. 4. Transportation of nutrients: hemoglobin can transport the body’s essential oxygen, lipoproteins can transport protein for the body to transport fat, but also to maintain the osmotic pressure balance in the body to help the body’s normal metabolism and all kinds of substances in the body’s delivery. In addition, people in the life can be appropriate intake of protein powder, and strengthen the body exercise, so that the body can be in the nutritional long-term stabilization of the state of health.