Some foods spoil within a few months of opening even though they have a shelf life of one year, why is that?
What is the expiry date?
The shelf life is the period of time during which a prepackaged food maintains its quality under the storage conditions stated on the label.
Storage conditions and storage time are two inseparable factors of shelf life. Storage conditions usually include room temperature, protection from light, refrigeration, freezing...
The shelf life is only valid under the storage conditions stated on the label. If the regulations are not followed, it may be shortened or even lose its guarantee of food safety.
6 foods that have been opened have their shelf life shortened up to 10 times
1. Spices
The shelf life of processed spices in sealed, unopened packaging is 1-2 years.
Once opened, the shelf life will be shortened and it is susceptible to damage if placed in a high temperature kitchen or even next to a gas stove.
Vegetable oil, soy sauce and vinegar can only be stored for 2-3 months after opening.
Peanut butter, salad dressing, ketchup and other sauce-making foods can only be kept for 1-3 months after opening.
To help extend the shelf life of rarely used spices, store them in the refrigerator.
2. Cooking oil
The shelf life of unopened cooking oil is typically 18 months.
Once opened, the shelf life of cooking oil will be greatly shortened, and should be used within 3 months.
If left open for too long and not sealed, the oil will react with oxygen in the air, causing oxidation, which can cause nausea, vomiting, diarrhea...
3. Rice
Unopened, rice has a shelf life of 1-2 years. Once opened, rice can be used for 1 year if stored properly. However, if stored improperly, rice can easily become moldy and develop insects.
After removing the outer packaging bag, the rice should be placed in another sealable container and placed in a cool, dry environment.
4. Powders
After opening the lid, flour, baking powder, etc. easily absorb moisture, clump, and mold. Therefore, after opening the lid, it should be consumed within 1 month and must be covered promptly and stored in a dark, dry, cool place.
The shelf life and storage of flours are similar to rice.
5. Nuts
Nut products in different packages are usually 6-12 months. Nuts have a high fat content, so after opening the lid, they are susceptible to moisture, oxidation, unpleasant odors and even toxic substances if not stored properly.
Therefore, after opening the lid, nuts should be eaten within a short time.
6. Sweet drinks
Once opened and tightly capped, carbonated beverages can be kept in the refrigerator for 3-5 days.
Highly acidic fruit and vegetable drinks such as hawthorn juice and citrus juice can be stored in the refrigerator for 2-3 days.
However, the beverage should be consumed within 24 hours of opening to ensure nutrition and safety.
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