Hello everyone, milk is the most common drink in our daily life. It is rich in fatty vitamins, high protein and other nutrients. So drinking milk, can play a very good role in our body calcium, as well as vitamins and so on, is very conducive to human health. < / P > < p > especially the protein rich in milk can play a very good role in improving our immunity. If there are old people and children’s friends at home, we must remember to give them more milk, especially children. < / P > < p > although milk is nutritious, when we buy milk, milk in supermarkets is mainly divided into two kinds, one is packed in boxes, and the other is packed in bags. In the face of these two different kinds of milk, they also have some differences. Now let me tell you something. < / P > < p > I learned this knowledge from a supermarket employee when I went to buy milk two days ago. You don’t have to look at the different packaging of milk, there is a big difference. < / P > < p > first of all, I’d like to show you the types of pure milk and the types and processes of pure milk, which can be divided into two types. The first is normal temperature milk, that is, milk is sterilized by high temperature, and then replaced with milk packed in the packaging box. This experience of ultra-high temperature sterilization, as well as the combination of packaging to avoid light, can effectively extend the shelf life of milk. < / P > < p > the second kind belongs to pasteurized milk, which cannot be sterilized by high temperature. Therefore, some bacteria will be retained in the milk. In order to prevent the reproduction of these bacteria, the milk can only be preserved in a low temperature environment, and the shelf life is very short, about a week. Compared with pasteurized milk, the nutritional value of normal temperature milk and pasteurized milk are similar, but the taste of pasteurized milk is better. Because pasteurized milk needs to be preserved at low temperature in the whole process, its preservation cost will be higher than that of normal temperature milk. < / P > < p > so 90% of the boxed and bagged milk that can be bought in the supermarket belongs to normal temperature milk. Pasteurized milk in the supermarket has a special selling area. When you buy it, as long as the milk in the refrigerator belongs to pasteurized milk. < / P > < p > when purchasing milk, we must take a look at the product type on the milk package. If it is full fat sterilized milk, it belongs to normal temperature milk. If the product type is followed by full fat sterilized milk, the milk belongs to pasteurized milk. < / P > < p > packaged milk and boxed milk are almost the same, but I suggest you buy boxed milk, because boxed milk will be better and more nutritious. < / P > < p > in the purchase of milk, many packaging will be written to avoid light, the main reason is that there are a lot of riboflavin, porphyrin and other light sensitive substances in the milk. Under the excitation of light, it will produce the activity of milk, so that the protein reacts with vitamins. < / P > < p > once milk reacts, its taste will change a lot, so when you buy milk, you must choose boxed milk. Boxed milk can play a good role in closing the light, not only can preserve the taste, but also can improve the milk storage time. < / P > < p > here are some of the above knowledge about milk. Do you need to supplement the knowledge about packaged milk and boxed milk? You can leave a message in the comments area. After pregnancy, do not let the wife do these five kinds of housework, the husband should be responsible for it, otherwise it is easy to hurt the fetus!