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The arrival of winter doesn't mean you're guaranteed to get sick, nor do you have to dole out all of your hard-earned dollars at the drugstore. "The newest research reveals certain lifestyle tweaks can boost your body's natural defenses to help you fend off colds and the flu," says Jacob Teitelbaum, M.D., author of Real Cause, Real Cure. These smart strategies can help keep your immune system in fighting form.