Eat this vegetable to reduce your flu risk

You can catch the flu at any time of year, but the risk tends to increase when it's cold outside. Winter brings more sneezing, and before you know it, a friend or coworker passes on a nasty case of the flu. They blow their nose endlessly, and a few days later you start feeling under the weather yourself. While you can't completely prevent it, you can give your immune system a boost—for example, by eating this vegetable more often.