Canned food is a staple in many pantries, prized for its convenience, versatility, and affordability. From canned tuna to diced tomatoes, these products are essential for quick meals and emergency situations. But How Long Does Food Last In A Can, really? While canned goods are known for their extended shelf life, it’s important to understand their longevity and proper storage to ensure safety and quality.
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Understanding Dates on Canned Foods
It’s crucial to understand that the dates printed on canned foods primarily indicate quality, not safety. As Mitzi Baum, MSc, food safety instructor at Michigan State University and CEO of STOP Foodborne Illness, explains, canned goods may have a variety of dates, including manufacturing date, facility information, lot code, and “use by” or “sell by” dates.
These “use by” and “sell by” dates relate to the product’s peak flavor and freshness. After these dates, the manufacturer can no longer guarantee the product’s optimal taste. However, the food might still be safe to eat if stored correctly.
Canned Food Shelf Life: How Long is Too Long?
So, how long does food last in a can? According to Bryan Quoc Le, Ph.D., food scientist and author, canned food can last indefinitely, often exceeding the “use by” date by several years. High-acid foods, such as tomatoes and other fruits, generally maintain their quality for about 18 months past the printed date. Low-acid foods, including meats, beans, and vegetables, can remain at their peak quality for two to five years.
Knowing When to Discard Canned Food
While canned food can last for an extended period, its shelf life depends heavily on its condition. The state of the can is paramount to ensuring the safety of its contents. Inspect cans carefully for the following warning signs:
- Dents: According to the USDA, avoid consuming food from cans that are leaking, bulging, severely dented, punctured, or rusted.
- Rust: Light surface rust might not be a concern. As Baum notes, “If you can wipe the rust off with a wet cloth, the food inside is still safe. If the rust is extensive and won’t wipe off, throw the can away.” Resources like the Packaged and Canned Food Defect Guideline by the Association of Food and Drug Officials can help determine if a can is safe to consume.
- Unusual Smells: Discard any canned food that emits a foul odor or spurts liquid upon opening.
The Risk of Botulism in Canned Foods
Deformed cans can develop microscopic holes, allowing small amounts of oxygen to enter. This creates an environment conducive to the growth of Clostridium botulinum, which produces a toxin that causes botulism, a rare but serious illness affecting the body’s nerves.
Best Practices for Storing Canned Food
Proper storage is key to extending the shelf life of canned goods. According to Le, canned foods should be stored in a cool, dry place. Avoid storing cans in warm, humid environments like under the sink, above the stove, or in damp basements, as these conditions can accelerate damage and rusting. The U.S. Department of Agriculture also advises against exposing canned goods to extreme temperatures, which can increase the risk of spoilage or can rupture the can.
Home-Canned Goods: A Different Set of Rules
Home-canned goods, if processed correctly, can also last for years, according to Baum. Over time, the product’s quality and nutritional value may diminish, but it will remain safe to consume. However, if the lid on a home-canned item pops or bulges, discard the item immediately. This indicates that bacteria, not killed during processing, have grown and released gases, causing the lid to expand.
Conclusion: Maximizing the Shelf Life of Canned Foods
Understanding how long food lasts in a can is essential for maintaining a safe and well-stocked pantry. By paying attention to dates, inspecting cans for damage, and following proper storage guidelines, you can confidently use canned foods for years to come. Remember, when in doubt, throw it out – your health is always the top priority.
