Parkinson's Early Clues: Smell Loss, Sleep Behaviors, and the Quest for Prevention

Parkinson's disease is discussed as a neurodegenerative condition linked to misfolded alpha-synuclein, with early non-motor signs such as reduced sense of smell and REM sleep behavior disorder often appearing years before tremors; evidence suggests initiation in the nose or gut with brain-wide spread, while environmental factors like air pollution, pesticides, and solvents may raise risk and drive prevention efforts. The Parkinson's Progression Markers Initiative aims to detect the disease earlier with biomarkers (e.g., alpha-synuclein assays) to speed treatments, but no current therapy slows progression; emphasis on exercise and sleep as important, potentially protective, interventions.