For instance, while canned goods may last for years beyond their “Best By” dates if stored correctly, perishable items like fresh dairy products or meat can go bad quickly, especially if they’re left out of the fridge for too long.
Shelf Life vs. Expiration Date
The term “shelf life” refers to the length of time a food product can be stored while maintaining its quality. In most cases, manufacturers test and estimate a food’s shelf life before printing an expiration date. But shelf life is different from the expiration date. The expiration date indicates the end of the shelf life, but a product could still be good to consume shortly after this date, depending on the circumstances.
For example, if you have a can of soup that’s a few months past its “Best By” date, it’s likely still safe to eat as long as the can is intact (no rust, bulging, or dents). However, the flavor or texture might not be as good as when it was fresh.
Factors That Affect the Shelf Life of Food
Several factors can influence how long food stays fresh and safe to eat, including:
- Storage Conditions
Proper storage is essential for extending the shelf life of food. For example, perishable items like meat and dairy products should always be refrigerated at the proper temperature. Many dry goods, such as grains, pasta, and canned goods, should be stored in a cool, dry place. The longer food is stored improperly—especially at high temperatures—the more likely it is to spoil prematurely. - Packaging
Vacuum-sealed packaging, for example, can significantly extend the shelf life of a product by reducing exposure to air and bacteria. Similarly, food stored in airtight containers tends to last longer than food exposed to moisture or air.
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