The gut microbiome is a collection of trillions of bacterial cells that reside in your large intestine. Learn all about the microbes that live in your gut, what they do and how they influence your health They can even communicate with your brain. From producing vitamins to breaking down dietary fibre, microbes in the gut are largely influenced by the food we eat. This is your no-nonsense guide to the breakthrough discovery of the gut microbiota and human health.