Some good ideas to keep yourself healthy during the cold winter months:

""According to traditional Chinese medical theory, each seasonal change challenges a different meridian. The change to fall, followed by winter, is considered the hardest time on the lung and kidney meridians. As the temperature drops outside, lung energy can be compromised by the dryness of our indoor heating. This affects the yin, or moisture, of the lungs as well as the defensive energy (immunity). We are also more exposed to airborne pathogens as windows and doors are closed. The cold can adversely affect the kidney meridian, too, which stores our vital force . Qigong can be helpful. Ginseng is also good. Tai chi (a form of qigong), while conferring these benefits, also tends to warm you up.""