Life most things in life there are two sides to every story, which means there are the good guys and the bad guys. When it comes to our health this involves healthy bacteria and dangerous bacteria.All creatures, including of course humans, have an amazingly complex but effective system to distinguish between the two, and to ensure that we don’t come to harm. It is our Immune System.This system has been evolving over hundreds of thousands of years and developing strategies to protect us every time it met with a new threat. This is often; as germs mutate when they meet resistance and our software needs frequent updating.The majority of the bacteria in our body is designed to be there. These are the friendlies and our home defence team. Without a gut teeming with them many of our systems would grind to a halt, our brains would not function and our blood would uselessly circulate our bodies without anything to transport. Our food would not be processed and nutrients would not reach the organs that depend entirely on them to survive.