(The Best Years in Life) We've been taught to believe that bacteria is a bad thing and we probably don't want to think about the trillions of them that should be living happily in our intestinal tracts. Intentionally swallowing down some more of them seems counter-intuitive, but the truth is that taking probiotics is one of the best interventions we can take to stay healthy or regain lost health. This is because the friendly bacteria living in our intestinal tracts are the foundation of the immune system. They hold the keys to our very existence. Read More.