Apples (and red onions, broccoli, and tea) are great sources of quercetin -- a flavonoid that may stave off the influenza virus when the body is under stress. In a recent study, quercetin did just that: The normal dip in immunity that comes with physical fatigue was pretty much cancelled out by the flavonoid. So as the weather changes grab what you need to keep the flu leaving with the winter weather!
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