"This bottle of edible oil has not passed the shelf life, you can eat; this can of milk powder expired, throw it away!" Most people actually have little knowledge of the shelf life of food, simply believe that food "not expired" is safe, "overdue" Harmful, in fact, we can not be framed by the shelf life of food, we must be flexible.
The definition of shelf life in GB7718-2011 "Labeling Standards for Prepackaged Foods" issued by the Ministry of Health on May 13, 2011 is: The period of time for which a food is maintained under the storage conditions specified in the label. Sometimes, you will find that although some foods are of the same type, but the shelf life of different manufacturers is very different, who has the best food shelf life? According to Fan Zhihong, associate professor of the Food Science and Nutritional Engineering College of China Agricultural University, food shelf life It is mainly determined by the manufacturer, but it does not mean that the manufacturer can fix it at will. Generally, it will undergo multiple tests to estimate the safety period of the food. Therefore, it means that it is safe to eat within the shelf life.
Not expired is not necessarily safe:
The shelf life of sauce-type foods is greatly shortened after opening
Many people simply think that food must not have any problems within the shelf life, so it's naive to know that the shelf life of foods is under proper storage conditions, that is, if your storage conditions are not met. To meet the storage needs of food, the shelf life of food may be shortened.
Professor Fan Zhihong exemplifies that all the pathogenic bacteria, spoilage bacteria, and most of the microorganisms were "executed" before the packaged food was opened and the food was in compliance with the shelf life requirements. However, once the food is opened, the bacteria will invade at a rapid rate, making the food shelf life basically “invalidâ€. For example, if the tomato paste has not been eaten for three days after it is opened, it will easily deteriorate, and this time the shelf life will no longer exist.
Therefore, after the food packaging is opened, the real food shelf life will be shortened quickly and it will be eaten as soon as possible.
Expiration is not necessarily harmful:
Expired yogurt or can drink
Not expired is not necessarily safe, then the expired food must be called the object to be thrown away! You still wrong answer, the food beyond the shelf life is not equivalent to certainly bad, can not eat or even toxic, which requires people to judge Depending on the circumstances. However, the food safety and taste during the shelf life is undoubtedly the best. It is recommended that food be consumed within the shelf life, but some foods are still edible after the shelf life, but the quality and nutrition will be reduced to some extent, but not There will be security issues.
For example, yoghurt, after expiration, if the color, state, and flavor are still normal, it can still be used for drinking, but the number of live lactic acid bacteria is greatly reduced, and the content of some nutrients will be reduced. For example, boxed fresh milk can be used to determine whether it is deteriorating, heating the milk to a micro-boiling state. If the texture is uniform and the taste is normal, the microorganisms are not excessive and can be eaten. If problems such as flocculation, sedimentation, sticky agglomerate, etc. occur, it means that it has deteriorated and is no longer edible. The same is the case of "milk", but the results are quite different. Therefore, whether "overdue" can continue to be eaten, it is necessary to use "eyes" to identify.
U.S. Food Engineering Ph.D., a member of the Scientific Squirrel Association, unwittingly wrote on his microblog that frozen foods, canned foods, biscuits, and other low-moisture foods are expired. Many of them are due to taste that exceeds the standards set by the factory. , and not become insecure. For such foods, if you are not so picky about taste and taste, you can safely eat them.
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