Why do avocados turn brown so quickly — and are they OK to eat at that point?

The news isn't so good for your leftover guac. "Conversely, if you smash up an avocado, it'll brown way more quickly, because ...
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Avocados stay fresh 14 days longer using clever storage method -they won't brown or spoil

Avocados are amongst the most beloved fruits as they're scrumptious on toast, but most folk are storing them incorrectly ...