Bacteria are all around us. In fact the sheer amount of bacteria on earth is mind-boggling. What some people don't know is that there are good bacteria and bad bacteria. In fact our bodies are more bacteria than they are, well, us! Bacteria cells outnumber our own cells 10 to 1. That's big. But did you know that there are more bacteria cells in our mouth than there are people in the entire world? Did you know our bodies contain Trillions, with a T, of bacteria cells?

But don't worry, our bodies work together with friendly bacteria colonies. Scientists call this our "Microbiome" and it helps us digest food, strengthends our immune system and fights bad bacteria.

HealthZam Update: New research from Canada and Israel have busted the 10 to 1 ratio as a myth! The actual ratio of human cells to bacteria cells is more likely 1 to 1.