The four properties and five flavors of food are the classification methods of food properties in traditional Chinese medicine. The four properties refer to cold, cool, warm and hot, and the five flavors refer to sour, bitter, sweet, pungent and salty. The four properties reflect the impact of food on the balance of yin and yang in the human body, while the five flavors correspond to the nourishing effect of the five internal organs. This theory originated from the "Huangdi Neijing" and is the basis of traditional Chinese medicine diet therapy. This article will focus on the definitions, functions, common food classifications and practical applications of the four natures and five flavors to help readers understand how to regulate the body through diet.

Among the four properties of food, cold foods such as watermelon and mung beans are suitable for clearing away heat and relieving heat; warm foods such as ginger and mutton can dispel cold and replenish yang. The five flavors are related to the five internal organs: sour to the liver (such as hawthorn), bitter to the heart (such as bitter melon), sweet to the spleen (such as red dates), pungent to the lungs (such as green onions), and salty to the kidneys (such as kelp). Modern research shows that this classification is related to the chemical components in food (such as alkaloids, volatile oils). For example:

In the actual diet, food needs to be selected according to your physique. People with yin deficiency and strong fire should eat cold and cool foods, while those with yang deficiency and fear of cold are suitable for warm and hot foods. Cantonese people often add wolfberry (sweet and warm) and Polygonatum odoratum (sweet and slightly cold) when making soup, which is the specific application of the four properties and five flavors. The well-known Chinese medicine doctor Zhang Zhongjing emphasized in "The Synopsis of the Golden Chamber" that "the five grains are for nourishment and the five fruits are for help", which is the practice of this theory.

Some products currently on the market also draw on this theory, such asTongrentangThe "Four Gentlemen Decoction" (ginseng, atractylodes, poria, licorice) is sweet, warm and tonifying the spleen.Yunnan BaiyaoThe "Notoginseng Powder" (slightly bitter and warm) is used to activate blood circulation and remove blood stasis. However, it should be noted that dietary therapy cannot replace drug treatment and is recommended to be used under the guidance of a physician.

Taken together, the theory of four natures and five flavors closely links food with human health. It is not only the essence of traditional Chinese medicine culture, but also has enlightening significance for modern nutrition. A reasonable combination of sex and flavor in daily diet can play a role in preventive health care. Readers can learn further through books such as "Traditional Chinese Medicine Diet and Nutrition" (People's Medical Publishing House).