This has to be divided into food products. Typically, the shelf life of food is always a little more conservative than the time when it was developed, so certain storage-resistant foods are really okay to eat even if they've been out of date for a while.

Canning: as a food science grad student back in the day, we were given a six-month buffer when we made our canned goods. That is, even if it was six months past its expiration date, it should be fine to eat. This is because the shelf life is always set a little shorter than the actual storage period. However, in the case of canned fruits, especially tin cans, it is better not to expire for a long time and eat them earlier. Because there are acids in the fruits, which will corrode the can walls over time, and it would be bad if some of the metal substances are leached out.

Rice and dried pasta: pasta can be expired for three months without any problem, unless the storage technology is very poor, water or air humidity is not good, easy to grow bacteria, otherwise it can be put for a long time. Rice is not much eaten abroad, but it can be made into a variety of foods. Flour and rice are both foodstuffs, and if the unsaturated fatty acids in them oxidize, they will not only taste bad, but will also be bad for your health. Noodles made from wet dough are more likely to have safety problems, even though they are handmade. If it is about to expire, try to eat it as early as possible.

Beans: same, dried beans can last a long time, if stored in a cool, dry place with no light. However, if they are exposed to the sun, the oils in them will oxidize faster, giving the soybeans a strange odor and making them inedible. Usually expired three months are not a big problem.

Seasonings such as salt. : Generally if it becomes a recognizable brand, salt and other seasonings that do not contain fatty acids and expire for a year are generally not a big problem.

Raw food, vegetables, meats, seafood, these things and processed foods containing meat are, arguably, harder to keep hidden. It's always best to open and eat them before labeling the expiration date.

So it depends on the type of food and you can't generalize whether you can eat it after the expiration date or not.

Dr. Chunyu is here to answer that question.

Food packages sold on the market will generally have a shelf life of the instructions, and in May 13, 2011, the Health and Welfare Commission issued the "standard for the labeling of prepackaged food" in the shelf life of the latest clear definition: prepackaged food in the labeling period specified in the storage conditions, to maintain the quality of the period.

In layman's terms.The shelf life of a food can be understood as the period of optimal consumption of the food product, the period of time during which the quality and quality of a food product is maintained under the conditions specified on the food label. Businesses are responsible for the quality of their products during the shelf-life period, so they will advise people to consume them within the shelf-life period, but the shelf-life period is not the only criterion for determining whether a food product has deteriorated or not.

Even foods within their shelf life may deteriorate prematurely due to the way they are stored, the environment, etc. For example, the shelf life will be shortened if the temperature is too high or too low, or if the package is opened.

In addition, the shelf life is not equal to the last edible time, more than the shelf life of the food, is not the same as sure deterioration, can not eat, some food from the point of view of safety is still edible, but its quality may have some kind of decline, for example, after the expiration date of the frozen food, the pathogenic bacteria may not be exceeded, after cooking and eating may not cause adverse reactions, but due to the storage of time is too long, texture However, due to the long storage time, the taste and flavor may change and the content of vitamins may decrease.

Whether or not a certain food is still good to eat after its shelf life cannot be generalized and needs to be specifically analyzed and identified.

Canned food, generally after aseptic processing or pasteurization, as long as there is no breakage, no bloating phenomenon, and there is no abnormal sour taste or smell after opening, it can be eaten. Some staple foods, dried fruits and beverages, generally there is no moldy gray spots, no moisture softening or discoloration turbidity and other phenomena, no spoilage can be eaten. But for ice cream, milk and milk products, raw and other such itself is not good to keep, especially easy to deteriorate food, it is recommended that the best in the shelf life of the timely solution, after the shelf life as far as possible to deal with do not eat, do not take risks.

I hope Dr. Chunyu's answer can help you, welcome to pay attention to the headline number [Dr. Chunyu] to get more health science knowledge yo.

Copyright: This article is the original manuscript of Dr. Chunyu, the copyright belongs to Dr. Chunyu, unauthorized reproduction is prohibited, 授权与合作事宜请联系reading@chunyu.me

Food spoilage is also a quantitative to qualitative process. It won't be good one day before the shelf life and completely bad the day after.

Shelf life is actually a standard, and for better food safety, many food products have a much more conservative shelf life set.

So, in a relatively good environment, the actual shelf life of a food product is much longer than the time it says on the package will keep it.

Different foods are best preserved in different ways, but the basic requirement is that you don't let bacteria or bugs eat the food before you do. Some foods are good for dry storage, some are pickled, some are best in the refrigerator, and some need to be frozen, just to name a few.

So much of the above is not actually used.

In concrete terms, tasting it and seeing if it tastes bad and not eating it is a signal in itself.

It's also a matter of practical judgment, as well as what the package says

For example, if a vacuum compressed food is not bloated, it is basically not a big problem. Whether a can has bulged or not, this can be used as an indirect judgment.