The purpose of the research is to determine the effects of a high-fiber nutritional
supplement (HFS) on the bacteria, viruses, and fungi that live in different regions of the
body in those with Parkinson's disease (PD). We will compare the bacteria, viruses, and fungi
of those with PD to those without PD (healthy controls). We will also examine the effects of
transplanting stool from humans into laboratory mice with or without Parkinson-like pathology
to understand how the microbiome influences the brains of animals. We can use this
information to get a better understanding of how changing the microbiome might help humans.