It may be gross to think about, but you depend on germs... all 100 trillion in or on your own body.It may be gross to think about, but you depend on germs... all 100 trillion in or on your own body.  They help you digest your food, pick the right person to love, and raise an alarm to the brain when something in your body goes haywire. So how do we embrace these germs?  Dr. Roizen talks with Jason Tetro, aka "The Germ Guy," about his new book, The Germ Files, and the critical role germs play in our everyday lives. While Tetro says 99.9% of germs are healthy (or at least harmless), a few germy spots make him say "yuck."  Find out which spots in your home really need a wipe-down, plus discover the amazing ways germs can boost your health... from slimming down to staying well. Bonus! Healthy Must-Haves for Your Pantry