Here’s what the dates on your canned foods really mean (and what you should follow instead)

Here’s what the dates on your canned foods really mean (and what you should follow instead)

This article is shared with permission from our friends at

Keeping a stock of canned goods in your pantry can be useful in times of need. When our food runs out and our produce expires, these non-perishables become our saving grace. But knowing which cans to select and which to avoid is key.

While we’ve been conditioned not to judge a book by its cover, canned goods are an exception to this rule.


According to the United States Department of Agriculture, certain cans have rendered their contents unsafe. On their website they say:

“Discard heavily rusted cans. Cans that are heavily rusted can have tiny holes in them, allowing bacteria to enter. Surface rust that you can remove by rubbing with your finger or a paper towel is not serious. You can keep these canned foods. If you open the cans and there is any rust inside, do not eat the food. Rust (oxidized iron) is not safe to eat.

[Moreover], if a can containing food has a small dent, but is otherwise in good shape, the food should be safe to eat. Discard deeply dented cans. A deep dent is one that you can lay your finger into. Deep dents often have sharp points. A sharp dent on either the top or side seam can damage the seam and allow bacteria to enter the can. Discard any can with a deep dent on any seam.”

Just as we feel for the firmness of a tomato prior to choosing one, we should also be mindful of the look and feel of a can before adding it to our cart.

What Makes Canned Food Unsafe to Consume?

food-consumers-eat-contamination.There is only one thing that will impact the safety of the food consumers eat – contamination. The inside of a sealed can is a sterile environment. No air equals no microbes equals no harm to the food. The natural process of decay will sap the vitamins and savoriness of the contents but the food will carry no harmful diseases.

Not all food reacts the same way to its canned incarceration, however. High-acid foods – tomatoes, citrus and other fruits – do not support food poisoning bacteria in any conditions and the offending germs will shortly die in such an environment. Low-acid foods – mushrooms, meats, green beans – typically receive a zap of sterilizing heat before canning. So, if faced with a can of food of unknown origins and age the higher the acid, the safer the contents.

infection-by-bacteriaAs mentioned above, a compromised can will be cause for concern. Any dents or damage in a can’s exterior may be an indication of seal issues. Any air that may seep into the interior can lead to disease-causing infection by bacteria. If a can is bulging or leaking it should be disposed of without consideration.

Fortunately there is no reason to worry about a can’s history before consuming its contents. That is because nature has provided each and every one of us with the best arbiter of a food’s safety available – our reliable senses. If food from a newly opened can looks rancid or smalls bad do not eat it, regardless of any date stamped on its lid.

So What Should I Know about Expirations Dates?


The first thing you should know about expiration dates is where they come from in the first place. And that is not from the federal government or any consumer watchdog agency. Unless you are buying infant formula the federal government has no interest in dating food – and dates on baby formula are only concerning nutritional quality, not safety. Some 20 state governments meddle in the expiration date business but that is again about food quality and not safety. And they are not issuing expiration dates but mandating that they are included on packaging.

The expiration dates are provided by manufacturers. And what exactly is “expiring?” There are actually two different guidelines consumers will encounter with canned food, a “sell by date” and a “use by” or “best by” date:

1 – “Sell by” date. This date is provided by manufacturers for the benefit of retailers. It is a suggestion – and only a suggestion – as to when the product should be removed from shelves. It is the manufacturer’s recommendation of when the product is at peak quality. With that date stamped prominently on a container the supermarket is obliged to remove the product or risk being sued should something go wrong – even though the contents are perfectly safe. That is why stores will throw out voluminous amounts of perfectly good food and sell products at deeply discounted prices when the ominous deadline looms.

2 – “Use by” date. This date is the manufacturer’s suggestion to the consumer of how long the product will be at peak quality. After that, the cookies may not be as crisp or the fruit salad as bright but the food is still fine to eat. It is the “use by” date that is the source of so many domestic squabbles as food lingers in pantries months and years beyond its supposed point of perfection.

How Do the Manufacturers Determine These Dates?

Again there are no rules and regulations on issue form any government agency. Instead, there are test kitchens and laboratory scrutiny and taste tests with panels of volunteers all paid and administered by the manufacturers of the products themselves.

What does that mean to consumers? Well, there are no ways to know when a can is plucked off a supermarket shelf how rigorous these tests have been before any date is stamped on the can. Or if any method beyond pure guesswork was employed at all.

The date could be conservative, to be “on the safe side” of consumption for quality. Or a date may come from a formula for production that was used years ago. As Bill Murray reminded us in Ghostbusters, “It’s more of a guideline than a rule.”

So What Should You Do With Your Canned Foods After the Expiration Date?

Eat Up.

The food is almost certainly fine, especially if only a reasonable amount of time has passed from any dates arbitrarily imposed on the package. If you want to live by a date on a can the United States Department of Agriculture says that high-acid canned goods should be good (and this is quality, not safety) for 18 months and everything else has a shelf life of 5 years.

It is estimated that Americans throw ten cents of every dollar’s worth of food into the trash. That’s works out to over $1,000 worth of eats per family – most of it still perfectly fine to consume – each year. Not only is that an unnecessary bite out of the personal pocketbook but food is a principle component of landfills and contributor to methane that is warming the planet. Not to mention all the fossil fuels and resources that were squandered to produce the food. It’s best for your wallet, it’s best for the planet – eat it.

Keep Them Stored.

Canned goods will not last forever. A long time, yes, but not forever. You should probably eat everything you buy sometime in Food-stockpiling-for-long-term-disasteryour lifetime. But you can maximize the shelf life of cans by minimizing temperature fluctuations. A steady environment of between 50 and 70 degrees is ideal but whatever you can provide avoid excessive heat and freezing.

And the drier the better. Moisture can begin the deterioration of aluminum of tin cans and will also contribute to mold and bacteria should the contents ever be exposed to oxygen. Sunlight will heat the contents and also negatively affect the shelf life of cans. It is not happenstance that people have stored food in cool, dry places for hundreds of years.


Since the food is likely still good to eat it will make a fine compost. Even if the canned goods have some preservatives or other chemicals the aerobic compost microbes will make short work of these and any other small contaminants. This also applies to any potentially spoiled food in a bulging or dented can.

Depending on your composting situation it is advisable to toss the canned food contents towards the center of the pile to minimize the temptation to rodents and other scurrying animals from scoring an easy meal. You can also dig a trench, dump the food into the ground, and cover it up with dirt.

Donate. food_drive

Enlightened food banks will accept cans with expired dates – up to a point. Do not expect any food bank to take anything. Damaged and bulging cans will never be accepted. Others won’t accept any food beyond the package date. Check with your local charities for instructions; many have arrived at a policy regarding expiration dates.


Some people believe the best way to explode the food expiration myth is to commercialize it. Doug Rauch, once a president of Trader Joe’s supermarket chain owned by the German family trust of Theo Albrecht, has proposed a solution for the food that accounts for 40 percent of trash that winds up in America’s garbage. He calls it “Daily Table” and his business model is to create and deliver nutritious and affordable quick-eat meals from all of the “expired” food in grocery stores that can be obtained with deep discounts or for free.

Many grocery stores are already integrated with food banks and shelters but much of that food can not be dumped or passed on because of liability issues. Entrepreneurs are increasingly coming up with schemes to churn this daily dump of food into money-making enterprises. Some day soon they may be looking to buy back canned food in private pantries.


You can open the cans, wash them out and recycle the metal. This conscientious act does require some care, especially if youRecycle-canned-food have damaged cans and jars. There are even government white papers dispensed just to outline the detoxification process involved in disposing of the contents of unsafe home canned foods.

At the very least wear latex gloves and be ready to attack any spillage with a good bleach solution. The potential botulinum toxin can be dangerous if it contacts the skin, not just when it is ingested. But when the cans are emptied and rinsed the metal containers can be safely recycled.

Toss Them.

In economics it is called “sunk costs.” You have already spent the money and the salvage value of the purchase is so diminished that there is nothing left to do but throw the cans out. You may want to double up on the plastic garbage bags to be certain the cans do not break out and break open on the way to their final resting place in a landfill.


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