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People who don't get enough sleep show higher levels of inflammation, say scientists who study colds. Smoking, chronic stress and lack of exercise can make you more susceptible to the viruses, too.
September 1, 2015 Just a couple extra hours can make a real difference, a study shows. Adults who slept only five or six hours were four times more likely to get sick when exposed to a common cold virus.
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Just the sniffles? Could be the flu.
March 17, 2014 Roughly 1 in 5 unvaccinated people had the flu between 2006 and 2011, but only a quarter of them had symptoms, a study found. That could affect how the virus spreads.
Sorry the vitamin D didn't help.
October 2, 2012 Some lab studies suggested vitamin D supplements might enhance immunity. But a clinical test in New Zealand found that taking vitamin D didn't reduce the frequency or duration of colds for the people who took the supplements.
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