It consists of colonies of microorganisms – over 1,000 species of bacteria, fungi and protozoa – that live in our digestive system. The bacterial flora, or gut microbiota, is a valuable ally for our health. First and foremost, it prevents the proliferation of pathogens and synthesises useful substances such as Vitamin K. In addition, it digests the most complex molecules and keeps our immune system in “training”. For this reason, we must try to keep these good bacteria healthy. We can do this with our daily diet, which allows us to provide energy and nutrients to intestinal microorganisms. We feed the bacteria and they help us to make the digestive system and the immune system work properly.