Foods containing protein are as follows: 1) animal meat, such as beef, lamb, pork, fish, shrimp, which are not only rich in protein but also of good quality. 2) milk, such as cow’s milk and goat’s milk, which have an average protein content of about 3% and have a high absorption rate. 3) eggs, such as eggs, duck eggs and quail eggs. 4) plant foods, such as beans, which have an average protein content of 30%. Beans, with an average protein content of 30%, are the only plant-based food that can replace animal protein.