Foods high in protein usually include meat, eggs, dairy, and beans. The more common protein-rich foods usually include meats such as pork, beef, and lamb (about 20% content). There are also eggs such as eggs, duck eggs and quail eggs (10-15% content), which are especially rich in protein. There are also milks such as cow’s milk and goat’s milk (2-4% content). In addition soybeans, black beans and other legumes (content of 35-40%) are also rich in protein. Protein is a very important nutrient for the human body. Not only is it an integral part of cells, but it is also responsible for most life activities. Therefore, protein supplementation through proper diet is good for the body. However, too much protein can burden the digestive system, so care should be taken to control the intake. Since different foods contain different proteins, it is recommended to enrich the food variety in the daily diet, and both animal and vegetable proteins should be supplemented.