The Myth: If You Go Out With Wet Hair, You’ll Catch a Cold.

The truth is: You will feel cold but will be just fine healthwise, says Jim Sears, a board-certified pediatrician in San Clemente, California, and a cohost of the daytime-TV show The Doctors. He cites a study done at the Common Cold Research Unit, in Salisbury, England, in which a group of volunteers was inoculated with a cold virus up their noses.
Half the group stayed in a warm room while the rest took a bath and stood dripping wet in a hallway for half an hour, then got dressed but wore wet socks for a few more hours. The wet group didn’t catch any more colds than the dry. Sears’s conclusion: “Feeling cold doesn’t affect your immune system.”