At present, more and more people are eating slimming products, one of which is protein Bar. Protein bar is generally made of purified soybean protein, casein, whey protein or the combination of the above protein, and its purpose is to supplement protein for people who lack protein. Protein is one of the most important nutrients for human growth and development to maintain all kinds of metabolism, and it is the material basis of human life, providing energy specially. All the tissue activities of the human body are completed by protein, and protein is necessary to maintain and repair the growth of the body and cells. It not only affects the growth of muscle and other body tissues, but also participates in the production of hormones, the maintenance of immune function, the transportation of other nutrients and oxygen, the production of hemoglobin and blood coagulation, so we should take enough protein every day.