The microbiome is a hot topic in Parkinson’s disease (PD). The microbiome is the network of microorganisms, along with viruses and bacteria, that help the body stay healthy. In the PD community, when we talk about the microbiome, we’re referring to the bacteria found in the gut. Leading experts have suggested that the microbiome has a potential role in the pathogenesis (way a disease develops) and in the treatment of Parkinson’s. This has sparked the idea that we might be able to improve PD symptoms if we change the microbiome through diet or other ways.