Do only packaged foods have a shelf life? Can food really be stored indefinitely?

The shelf life is only available in prepackaged foods. Food cannot be stored indefinitely. Unpacked food. Therefore, packaged foods have a shelf life in order to better manage these processed packaged foods and ensure everyone's safety. The foods listed in this paper, such as beans, dried fungus, rice flour, dried tangerine peel, dark chocolate, vanilla extract and so on. , are pictures of bulk food, not prepackaged foods itself, of course, there can be no shelf life. In the national standards, there are some foods exempted from shelf life, including five categories: beverages and wines with alcohol content greater than 10%; Vinegar; Edible salt; Solid sugar; Monosodium glutamate. But it does not include honey, so the packaged honey should be marked with the shelf life. Shelf life ",that is, the last edible date of food, also refers to the last edible period of food under normal circumstances. Most of the foods mentioned in this article are open and bulk, which are actually very perishable and cannot be preserved for a long time.

For example, the beans, dried fungus, mushrooms, rice flour and dried tangerine peel mentioned in the article are all dry and can be preserved for a long time. However, this does not mean that it can be put down indefinitely. If the storage conditions change, such as wet Kaifeng, it will also be moldy and insect-infested. When buying daily food, we often buy bulk food without shelf life. Considering that it is difficult to accurately judge the shelf life of food, it is suggested that if the food has obvious changes such as mildew, odor and moth, try not to eat it. Vegetables are easy to lose nutrients such as vitamins and produce nitrite, which will rot and deteriorate after long-term storage. Especially leafy vegetables, such as spinach and water spinach, are particularly resistant to storage. Even if stored at low temperature, the storage period is usually within 3-5 days. It's best to put it in the refrigerator in time after buying it home. Raw staple foods such as rice, flour and beans are easy to store. They are afraid of humidity and insects. When storing, try to use well-sealed fresh-keeping bags and boxes and put them in a cool, dry and well-ventilated place.

Eat as soon as possible after opening. Food preservation has a great relationship with the storage conditions of Takuwa. Generally speaking, the higher the storage temperature, the shorter the storage time of the same food. For example, it can be stored at-18℃ 12 months, which does not mean that it can be stored at room temperature of 25℃ for such a long time. It is required to keep it sealed for half a year, but if it is left open, it won't last that long. Therefore, when storing food, we must pay attention to putting the food in suitable conditions. After buying home, raw meat can be cut into small pieces. After cleaning the surface, put it on a fresh-keeping bag and store it in the freezer of the refrigerator. If you need to eat a little meat every day in the last 2-3 days, and you are afraid of the trouble of thawing, you can keep it in the fresh-keeping room of the refrigerator.

In the fresh-keeping room of the refrigerator, fresh raw meat can generally be stored for 3-5 days, and poultry raw meat can be stored for 1-2 days. In the freezer, red meat can be kept for about 1 year, and beef can be kept for a long time because of its low fat. Poultry meat is usually frozen for about 8- 10 months. The shelf life of seafood and fish is generally about 4-6 months. When buying food, it is recommended that you buy enough food for 2-3 days, especially fresh vegetables and fruits. Don't hoard too much to avoid unnecessary food waste. Even during the period of epidemic isolation, the food supply in the community is sufficient, so don't worry too much. As long as we take good protection, go out less, wash our hands frequently, pay attention to wearing masks, supplement enough nutrition in time, exercise more, eat and drink enough, and the rest will wait quietly for the end of this victory.