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How long does it take for boxed cereal to get stale?

Asked by stemnyjones (3976points) December 12th, 2009

I have a few boxes of cereal I’ve had for a month or two now. The open boxes are stale, but I have a box of Frosted Flakes that was never opened. The expiration date says July of 2010, but can it have gotten stale from sitting in the pantry for so long anyway?

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