> a propensity for catching the flu every year. I don't think that a faraway childhood affects resistance to the flu, right now, significantly. Maybe to some o

> a propensity for catching the flu every year. I don't think that a faraway childhood affects resistance to the flu, right now, significantly. Maybe to some of the maladies mentioned in the article. The fact is the immune system is an engine, just like everything else in the human body. People who exercise more get sick less often. People who exercise more get sick less severely. People who have sex more often have more immunoglobulin A. People who sleep more, get sick less often. If you get the flu more often than you'd like, start exercising more, having more sex, or sleeping better. Ideally all three.