By Lucy Danziger and the staff at SELF One sure sign that winter is on its way: Drugstores are already advertising for flu shots, and in fact, some started weeks ago! If you haven’t gotten your vaccine yet, there’s still plenty of time, but do schedule one: It reduces your risk for infection by as much as 90 percent, says Anne Moscona, M.D., professor of microbiology and immunology at the Weill Cornell Medical College in New York City. And while you’re at it, try working some of these delicious immune-boosting foods into your daily diet to fight cold-weather bugs naturally […]