In recent years, a number of studies have emphasized the dual importance of the gut microbiota in maintaining the host's health. The term "gut microbiota" refers to the diverse population of commensal microorganisms, primarily bacteria but also including fungi, archaea, and viruses that live in the large intestine and other parts of the digestive tract. It can be viewed as one of the factors to which we are continuously exposed, at high doses, throughout our lives. In the gut, complex interactions between the resident gut bacteria and the human body take place. Numerous metabolites and bio products that are produced by gut bacteria aid in keeping the host and the gut in balance.