8 canned foods that can become unsafe if stored too long
That mystery can hiding behind the pasta boxes might have been there since your last apartment.
Canned foods are pantry heroes precisely because they last so long. But “shelf-stable” does not mean “immortal.” Heat, rust, corrosion, leaking seals, deep dents, and years of forgotten storage can eventually turn an ordinary pantry staple into something you should not eat.
The USDA recommends using most high-acid canned foods within 12 to 18 months for best quality, while low-acid canned foods generally have a two-to-five-year recommended storage window. Properly processed commercial cans can remain safe beyond those periods if the container stays intact and storage conditions are good, so an old date alone doesn’t automatically mean the food is dangerous.
Still, some cans deserve a closer look than others.
Canned Tomatoes
Tomato sauce, diced tomatoes and tomato-based soups are probably sitting in millions of American pantries right now.
They are also relatively acidic. That acidity can slowly interact with the container over long periods, which is one reason USDA places tomato products among high-acid canned foods with a recommended storage period of about 12 to 18 months for best quality.
An unopened can slightly past its date is not automatically unsafe. But an ancient tomato can covered in rust or showing swelling, leaking, or severe dents should head straight for the trash.
Acidic contents can contribute to corrosion over time, making this one category worth rotating regularly rather than forgetting for years.
Canned Pineapple, Peaches and Other Fruit
Those cans of pineapple rings and peaches you bought for a holiday dessert three years ago deserve another look.
Fruit is another high-acid canned category. Beyond 12 to 18 months, flavor, texture and appearance may gradually deteriorate even when the container remains safe.
The real warning comes from the package.
The FDA advises consumers not to use canned goods that are swollen, leaking, badly rusted, punctured, or severely dented, particularly around seams.
Canned Tuna and Salmon
Emergency kits and pantry shelves often contain tuna because canned fish keeps dramatically longer than fresh seafood.
Fish falls into USDA’s low-acid canned-food category, which carries a general two-to-five-year recommended storage period for best quality when kept in good conditions.
The can matters just as much as its age. If your old tuna can is swollen, leaking or seriously rusted, don’t open it for an investigative sniff.
CDC warns that botulinum toxin cannot reliably be seen, smelled or tasted. Even tasting suspect food to decide whether it is safe is a bad idea.
Canned Chicken, Ham and Other Meats
Canned meats are built for long-term storage, but they shouldn’t become family heirlooms.
Store commercially canned meat in a cool, dry place; it generally maintains its best quality for about two to five years. Properly processed canned meat can remain safe considerably longer if the container stays sound, although quality can deteriorate.
Temperature is particularly important.
USDA warns that temperatures above 100°F can harm canned foods and that spoilage risk rises sharply as storage temperatures increase. Storage below 85°F is preferable.
That makes the cabinet beside a hot stove or a sweltering garage a poor long-term pantry.
Related Post: 6 Cheap Frozen and Canned Foods That Can Be as Healthy as Fresh Produce
Canned Beans
Black beans, kidney beans, chickpeas, and baked beans are dependable cans that somehow end up in the back of cupboards.
Most beans are low-acid foods, putting them in that broad two-to-five-year best-quality window.
But once you open them, the rules change considerably. USDA recommends refrigerating opened low-acid canned foods such as beans and using them within roughly three to four days.
So that half-can of black beans tucked behind the milk for a week deserves more concern than an intact unopened can sitting safely in your pantry.
Canned Corn, Peas and Green Beans
Like beans, most canned vegetables are low-acid foods with excellent shelf lives.
They’re also especially important when talking about home canning.
Improperly canned, preserved, and fermented foods are common sources of foodborne botulism, and low-acid foods need special attention. Pressure canning is the recommended method for safely canning low-acid foods such as vegetables.
The risk is rare, but serious. CDC’s 2021 surveillance recorded 22 foodborne botulism cases nationwide among 273 reported botulism cases overall.
Canned Soups, Stews and Chili
That tower of soup cans purchased during a warehouse-store sale can hang around surprisingly long.
Many meat-and-vegetable soups, stews, gravies and similar products fall into USDA’s low-acid category and generally fit the two-to-five-year recommended storage range for best quality.
Tomato-heavy soups may be considered high-acid products, however, and typically have shorter quality recommendations.
Whatever the variety, inspect the package. Bulging ends, leaks, severe dents, and extensive rust aren’t quirky signs of age. They’re reasons to discard the product.
Home-Canned Foods
This is the category where you should be especially cautious.
Commercial canning operations use carefully controlled processing methods. With home-canned food, safety depends heavily on whether the correct recipe, pressure, temperature, and processing time were followed.
A contaminated jar may not look, smell, or taste spoiled. If you don’t know how an old jar was processed, don’t gamble on it.
The Pantry Rule Worth Remembering
Canned food doesn’t automatically become dangerous because the date on the label has passed. Condition and storage matter enormously.
Keep cans somewhere cool and dry, rotate older products toward the front, and periodically inspect forgotten items.
Most importantly, follow the government’s simple warning signs. If a can is bulging, leaking, badly rusted, punctured, or deeply dented, throw it away. And if liquid or foam spurts from a container when opened, don’t taste the contents.
A 99-cent can of beans is never worth turning dinner into a food-safety experiment.
