Believe or not but we share our body with billions of itty bitty bacteria. In fact, these microscopic bacteria make up 1-3% of our total body mass! Bacteria inhabit all areas of our body including our mouth, skin, organs and vagina. Each area of the body has its own unique inhabitants with the human gut containing 500-1,000 different bacterial species. While we have yet to discover the function of the large majority of the bacteria we do know that some help regulate our immune system. Bacteria in our gut help us break down carbohydrates that we normally would be unable to digest, such as fiber.