Be a Social Butterfly
If you know more about what’s going on in Oprah’s life than in the lives of your family and friends, it’s time to get out more: Scientists have found that the lonelier you are the weaker your immune system becomes. So don’t vegetate in front of the tube again tonight. Whether you prefer to play poker or sing hymns, an active social life can help give your immunity a lift.
Replenish Your Probiotics
Most of your immune cells reside in your digestive tract, which means that the beneficial microbes called probiotics can help bolster your immune defenses. Make plain yogurt that contains live cultures a regular part of your diet and consider taking a supplement that contains not only intestinal probiotics but also S. salivarius K12, which occupies the mouth and nose.
Stay Hydrated—Inside and Out
Plenty of pure water will help keep your immune system in top shape. (If you don’t do bottled water, make sure you filter what comes out of the tap.) In addition you should run a humidifier in the winter, when heated indoor air can dry out your mucous membranes, the body’s first line of defense against germs.