(Natural News) The human stomach, the saliva, and the large and small intestines are like a rain forest, teeming with more than five thousand living species of bacteria. These bacteria cells outnumber human cells 10:1. Every moment of every day, several trillion bacteria cells interact with one another and coordinate vital functions inside the body. Together, these bacterium regulate the gastrointestinal tract and create metabolites for proper digestion and hormone regulation. They help eliminate waste and protect the blood from toxins. They respond to outside threats and initiate immune responses.