January 22, 2026

@michaelokun

Parkinson’s disease maps tell a story across the Netherlands. What does incidence mean? Incidence refers to how many new cases of a disease occur in a population over a defined period of time. Simões and colleagues describe in a new paper in The Lancet Regional Health Europe how Parkinson’s disease incidence and geographic patterns unfolded across the Netherlands from 2017 to 2022. They used nationwide health data. Key points: - Parkinson’s disease incidence across the Netherlands was relatively stable over the study period at about 22 new cases per 100,000 person years. - Incidence increased sharply w/ age and was higher in men than women across nearly all age groups. - Clear geographic clustering emerged, w/ higher risk in northern regions and lower risk in southern regions, patterns not readily explained by air pollution, farming intensity or urbanization. My take: This study reinforces that Parkinson’s disease is not randomly distributed. Geography matters, biology matters and the environment still looms large, even when the usual suspects do not fully explain the map. Here are 5 points that resonated w/ me: 1- Parkinson’s disease incidence was remarkably stable before the pandemic, reminding us that prevalence growth is driven by aging and survival rather than exploding new cases. 2- Regional clustering suggests there are local factors shaping risk, even in a country w/ universal access to health care providers. 3- Known environmental indicators did not line up neatly w/ risk maps, signaling we may be missing key exposures or timing effects. 4- Higher incidence in wealthier and partnered households may reflect detection differences rather than true protection in lower socioeconomic groups. 5- These kinds of national maps should guide smarter prevention research and help focus efforts on modifiable risks so folks are not left guessing where Parkinson’s comes from. https://www.thelancet.com/journals/lanepe/article/PIIS2666-7762(25)00357-6/fulltext #michaelokun #fixelinstitute #parkinson #lancet