Unexpected or excessive swelling in food packaging—which can signal gas-producing microbial activity or dangerous bacterial contamination like botulism in cans—should never be ignored, even if the product is still cold, within its expiration date, or smells normal. Because dangerous pathogens cannot be reliably detected by taste or appearance, shoppers should avoid tasting suspicious foods and instead evaluate the entire condition of the package, keeping in mind that when safety remains uncertain, throwing the product away is always safer than taking a chance.
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