Some people seem to survive cold and flu season with nary a sniffle.

And yet plenty others seem to catch cold after cold; sidelined with a perpetually stuffed-up nose and hacking cough that lasts all winter long. So what's different between these two groups? Research shows your cold and flu vulenabrility may come down to a few important--and unexpected--habits, like how much sugar you eat or how dry your nose is.

Assess your risk with these signs of impaired immunity,and learn what you can do to stay healthy. 

Nary : colloquial for `not a' or `not one' or `never

Sidelined:کنار

vulenabrility: آسیب پذیری