The Yellow Emperor's Internal Classic records: "The lungs are rich, and how to treat the festival." In other words, the lung is equivalent to the position of the prime minister, and it is very important to coordinate the officials. The lung is not only a respiratory organ, but also plays the role of regulating qi, regulating water circulation and grooming hair. Therefore, it is very important to maintain the lungs.

People live between heaven and earth and are inextricably linked with the environment and the universe. The relationship between the five internal organs of human body and the five colors of nature is a good proof. In the theory of five elements in traditional Chinese medicine, there are five elements in heaven and earth, and people have five internal organs. Five behaviors are fire, wood, earth, gold and water, corresponding to the five internal organs of human body, namely heart, liver, spleen, lung and kidney. At the same time, the five internal organs also correspond to five colors, namely, red, blue, yellow, white and black. These five colors, which we are familiar with in our daily life, enter different viscera and play different health care functions.

White belongs to gold in the five elements, which is beneficial to lung qi, so white food is the most nourishing lung.