Proteins are used to make up human cells, participate in immunity and energy supply of the human body. 1. Composition of human cells: proteins are an important part of human cells, skin and other tissues, and can repair damaged organs, renew cells, and participate in the growth and development of the human body. 2. Involved in human immunity: proteins are involved in the regulation of the body’s important immune system, is an important part of the antibody, to maintain the normal immunity of the body. 3. Provide energy for the body: proteins have the role of maintaining the body’s normal metabolism, the decomposition of proteins can provide the body with the necessary caloric energy, to assist in the transportation of other nutrients. Protein is an important part of human tissues and cells, so the human body must consume a certain amount of protein in moderation every day to avoid a decline in resistance.