Analysis of microbes in the gut can reveal whether a person faces an elevated risk of Parkinson’s disease, before they have developed any symptoms, suggests a new study led by UCL researchers. The scientists found that people with Parkinson’s disease have a distinctive makeup of gut microbes, as do healthy individuals who are genetically at risk of Parkinson’s disease, they report in the new Nature Medicine study. The researchers say their findings could help in developing tests to reveal a