According to the query Gourmet World shows that: old fire soup usually refers to a longer time to make soup, usually need to boil and continue to cook for a period of time, usually more than 2-3 hours. Old fire soup is characterized by sufficient fire, soup flavor is rich, fresh and sweet, rich in nutrients. However, the longer you boil the soup, the better. Prolonged boiling of soup will lead to excessive purine and fat content in the soup, which may cause high blood pressure, gout and other diseases. Therefore, it is recommended that when making soup according to the characteristics of the ingredients and herbs to master the time to make soup, not too long or too short. Generally speaking, meat soup boiled about 1 hour, the longest not more than 2 hours; fish soup time control within 1 hour.

Additionally, if you want to reduce the purine content of the soup, you can add some ingredients that can remove and inhibit nitrites, such as scallions, onions, etc.; or eat some fruits rich in vitamin C, such as oranges, kiwis, etc., after drinking a long time of soup.