Gut bacteria may predict Parkinson's disease years before symptoms

Key Points:

• A University College London-led study found that specific gut bacteria patterns could predict Parkinson’s disease risk years before symptoms appear, based on analysis of gut microbes from 271 diagnosed patients, 43 gene variant carriers without symptoms, and 150 healthy controls.
• Non-symptomatic carriers of the GBA1 gene variant showed intermediate microbial changes, suggesting gut microbiome alterations may precede Parkinson’s symptoms, with similar findings replicated in over 1,400 participants across the UK, Korea, and Turkey.
• A diverse and balanced diet was associated with lower microbiome patterns linked to higher Parkinson’s risk, highlighting potential lifestyle impacts on disease progression.
• Experts noted the study supports the gut-brain axis theory, proposing that Parkinson’s pathology may begin in the gut decades before motor symptoms, and emphasized the importance of early detection and intervention to slow disease progression.
• The study was observational and cannot confirm causation, with researchers acknowledging that genetic and environmental factors also influence Parkinson’s development; further research is needed to validate findings and develop early diagnostic tools.