Researchers testing samplesAbout 153,000 people in the UK are currently living with Parkinson’s, a neurodegenerative condition that mostly affects the dopamine-producing neurons found in a part of the brain called the substantia nigra.It can lead to physical changes like tremors, muscle stiffness, and trouble with walking and balance. The condition can also create “non-motor,” or non-movement-related, changes like “depression, anxiety, apathy, hallucinations, constipation, orthostatic hypotension, sleep disorders, loss of sense of smell, and a variety of cognitive impairments,” Parkinson’s Foundation writes.A new study published in Gut Microbes has linked mouth and gut bacteria to the