We are never alone with around 38 trillion bacteria co-habiting our body. These bacteria along with a whole host of other organisms make up our microbiome. Our microbiome has co-evolved with us and has many vital roles for our health. Bacteria also have an amazing ability to change and enable their host to do things they couldn’t normally do. However, changes in our microbiome are also linked to a whole host of diseases and conditions including obesity. The big question is whether we change our microbiome and exploit its beneficial functions. Find out how our microbiome is so important for our wellbeing and the extreme measures some people are taking to manipulate it.