The link includes a video of the actual testing by experts and the owner of the can of lard , 87 year old Hans Feldmeier, who was handed the can of lard by US troops in Germany.
Hans took the can to field experts who opened it and after determining that it was still edible, spread it over a few crackers and ate it!
If you go by the textbook, cans of food last a couple years and little more. If you go by actual experience, there’s cans that have been found underwater dating from the civil war that were still edible.
In theory, if the food was canned and sealed inside when sterilized, there should be no bacteria in there to turn it bad.
While some acid vegetables may be the exception, the truth is that properly canned food lasts way beyond its expiration or “best by” date.
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