4. Stay hydrated
Keeping enough fluids in your body lets blood circulate more freely, which allows flu- and cold-fighting white blood cells to properly position themselves to fight off infection. Aim for the usual eight glasses of water a day. Water-rich fruits and vegetables, like watermelon, cucumbers, and grapefruit, do count, but dehydrating liquids (i.e., those with caffeine or alcohol) do not. Especially during flu season, pair each alcoholic drink with a glass of water to help stay hydrated, suggests Furuya.
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