Most expiration dates are total guesses. Now the packaging can tell you when it's actually time to throw it out.
Food waste is partly a communication problem: Even after its "best by" date, your milk probably isn't actually expired. The label (along with "sell by," "best before," and "enjoy by") has nothing to do with food safety. It's just a somewhat arbitrary sign of how long a manufacturer thinks it might taste best—but consumers tend to take it as a sign to toss food out.
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