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 libation with a glass of water to help stay hydrated, suggests Furuya.
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