Storing food in the refrigerator for four days is a hurdle. Many people regard the refrigerator as a "food sterilizer" at home and think that the food stored in the refrigerator is hygienic. In fact, the refrigerator will breed a lot of bacteria because it stores food for a long time and is not cleaned often. Dr Michael Conan Doyle, director of the Center for Food Safety at the University of Georgia, pointed out that although the food in the refrigerator looks fresh, it has actually gone bad. Cooked meat should not be stored in the refrigerator for more than 4 days.

The common refrigeration temperature of food in the refrigerator is 4 to 8℃. In this environment, the growth rate of most bacteria will slow down. But some bacteria are psychrophilic, such as Yersinia, Listeria, etc., which can grow and reproduce rapidly at this temperature. If you eat food infected with this kind of bacteria, it will cause intestinal diseases. The temperature in the freezer of the refrigerator is generally around-18℃. At this temperature, bacteria are generally inhibited or killed, so the food stored in it has better fresh-keeping effect. But freezing does not mean that it can be completely sterilized, and some bacteria with strong freezing resistance will survive. So on the other hand, if the refrigerator is not disinfected frequently, it will become smaller.

A hotbed of bacteria. Don't store any food in the refrigerator for too long. It is best to eat it as soon as you buy it, because long storage time will not only affect the delicious food, but also easily produce odor. There are also some fruits, such as bananas and apples, which are easy to deteriorate if they are kept for a long time. Once it deteriorates, it will emit a gas harmful to human body. Don't store too much food in the refrigerator, it will make the external temperature of food low and the internal temperature high, which will lead to deterioration.

Hope to adopt