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We’ve all heard the adage, “When in doubt, throw it out.” But what if that carton of slightly squishy berries or less-than-fresh bag of bread could signal to you whether it should be tossed or eaten? McMaster University researchers have developed a set of tests that do just that. They say that swapping “arbitrary and far too conservative” best-before dates with “smart packaging” has the potential to curb food waste and reduce the risk of foodborne illnesses.