Researchers say, keeping your feet warm may reduce your chance of catching a cold by as much as 67 per cent. British researchers believe that when your feet are cold, blood vessels located in the sinuses tend to tighten, which makes it more difficult for white blood cells to get in the mucus membranes of the sinuses (where most viruses sneak in). Don't roam barefoot, and slip on a pair of socks before you snuggle into bed. That helps dilate your blood vessels, and let immune cells travel where they are needed.
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