Kong, a professor of food science in dalian polytechnic university, explained that if you want to know whether food is edible, you should first look at the shelf life of the food. Generally speaking, the shelf life of food is the best edible period of food. This time is usually measured by experiments. After this time limit, the quality of the product may change, such as the decline in nutritional value, excessive microorganisms, product oxidation and so on. , indicating that the food is no longer suitable for sale. What needs to be emphasized here is that the national regulations prohibit the sale of food beyond the shelf life.

But when consumers buy food, it doesn't expire, because they don't want to throw it away because they keep it for too long. What should they do? Kong Dong Fan introduced that, in fact, the shelf life of food is closely related to the storage conditions of food, some need to be stored at room temperature, and some need to be stored in cold storage or in the dark. If consumers can improve a preservation standard after purchase, such as keeping food stored at room temperature in cold storage, then its shelf life will be slightly extended. The extended time is related to the kind of goods. For example, if milk is stored at room temperature for 7 days, the storage time can be extended by 1.2 days, which has little effect on healthy people. Dry food, such as grilled fish fillets, instant noodles and other foods, can extend the time; But some foods that are particularly easy to breed bacteria should be eaten as soon as possible.

In addition, whether you can eat food with shelf life is also related to your physical condition. Young people in good health may have no adverse reactions after eating the food that has just passed the shelf life, while people in poor health, such as the elderly and patients, may have obvious reactions after eating the food that has passed the shelf life. For reference.