Why does the holiday season always seem to coincide with flu and cold season? Dr. John Young, a physician specializing in the treatment of chronic illnesses says it has a lot to do with holiday diets. Check out his tips to ward off getting sick:

Get your vitamin D! Vitamin D is actually a hormone, not a vitamin, and one of our best sources for it is sunshine.

"Unfortunately, many people work indoors all day, so they get little sun exposure," Dr. Young explained. "When they do go outside, they wear long sleeves and sunblock to protect against skin cancer."

"One of the many cellular benefits of exercise is that it increases the oxygen in our bloodstream. Every cell in our body requires oxygen, so consider exercise another means of feeding your cells," the expert explained.

It's also important to manage stress during the holidays. With unchecked stress, our body releases large amounts of cortisol which, among other things, suppresses the immune system.

"Take time out to meditate, listen to music, or take a walk in the woods," Dr. Young says. "It feels good - and it's good for you!"

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