Talk of the Nation today discussed Nadia Arumugam's new piece at Slate, titled "Ignore Expiration Dates."
Apparently these dates are mostly set by the manufacturers with little to no direction from the Feds. She says they're generally set very conservatively to prevent dummies from drinking bad milk that they probably stored poorly in the first place.
She points out that you're perfectly capable of telling that your milk went bad and recommends you trust your senses over statistically calculated risk thresholds.
I guess this means I'm not a rebel for eating expired food all the time...