Inside your gut is a thriving community of trillions of microbes. Thousands of species of bacteria, viruses, fungi and other microorganisms make up this diverse microbiome, which weighs about 2kg. Its health is affected by your environment and what you eat, and in turn it affects your metabolism, immunity and even your mood.
To be healthy and to keep humans healthy, the microbiome needs to be diverse. That has become an increasing problem in the modern world, where diets are less diverse and get battered by medical treatments such as antibiotics.
