Immune health seems to be on everyone's mind these days. Although it would be nice to take a magical concoction that makes us invincible to any cold or virus, the science is not quite there yet. What we can control is our lifestyle. Of course, it does not make us bulletproof, but it certainly can make us more resilient. There should be no argument that feeling run down, eating poorly, getting very little sleep, sunlight, and exercising can make us vulnerable. Have you ever gotten sick after a week of exams, a stressful work week, or a night of too much alcohol? Case in point.