Yeast contains a lot of purines, and we come into contact with fermented foods almost every day, such as steamed bread, bread, yogurt, cheese, liqueur, beer, fruit wine, fermented bean curd, laba bean, soy sauce, lobster sauce, soybean paste, monascus fish, monascus meat, black tea and so on. According to the analysis of purine content in yeast, every100g of dry yeast contains 589 mg of purine, so gout patients must not eat dry yeast directly.