The United States is experiencing a significant increase in Parkinson's disease diagnoses, with over 90,000 new cases identified annually, a 50% rise from previous estimates. Projections indicate that 1.2 million Americans will be living with the condition by 2030. A recent analysis of nationwide data has uncovered a notable geographic divide in diagnosis rates across states, suggesting potential environmental or lifestyle influences.
Nebraska reported the highest rate of Parkinson's diagnoses at 561 per 100,000 individuals, followed by Kansas (517 per 100,000) and Utah (493 per 100,000). Arkansas and Florida also ranked among the states with the highest incidence. Conversely, Montana showed a significantly lower diagnosis rate.
Potential Factors in Geographic Variation
Neurologists and researchers point to several factors that may contribute to these striking differences. Exposure to pesticides, prevalent in agricultural regions like Nebraska and Kansas, is a leading suspect. Studies have repeatedly shown associations between pesticide exposure and Parkinson's disease, with some research suggesting that certain chemicals can damage dopamine-producing neurons, which are central to the disease's progression. The herbicide paraquat, still permitted for restricted agricultural use in some U.S. states, and glyphosate, historically used on U.S. farmland, are among the chemicals under scrutiny.
However, pesticides do not fully explain the pattern. Utah, despite having low pesticide use according to U.S. Geological Survey data, ranks third in diagnoses. The state health department primarily cites an aging population, with 13% of adults over 65 in 2025, a figure expected to reach 24% by 2065. Experts also note Utah's history of air pollution linked to mining and industrial activity, and growing evidence connecting long-term exposure to fine particulate matter (PM2.5) with an increased risk of Parkinson's. Additionally, demographic factors, such as Utah's predominantly white population, are considered, as Parkinson's is diagnosed more frequently in white individuals compared to Black or Asian groups, though disparities in healthcare access could also play a role.
In Arkansas and Florida, pesticide exposure in heavily farmed areas, such as South Florida's sugarcane regions, is also being examined. U.S. Geological Survey research has detected glyphosate in local waterways and wildlife in these areas.
Montana's lower diagnosis rate is more difficult to interpret due to its small, dispersed population. Limited access to healthcare and a potential shortage of movement-disorder specialists may contribute to suppressed diagnosis rates in such areas.
Broader Context and Lifestyle Recommendations
The disease can affect individuals at various ages. Actor Michael J. Fox was diagnosed at 29 in 1991, former NFL quarterback Brett Favre revealed his diagnosis in his 50s in 2024, and singer Carly Simon disclosed her diagnosis at 83.
While the exact cause of Parkinson's remains unknown for most individuals, experts emphasize focusing on controllable lifestyle factors to potentially lower risk. Recommendations include adopting a Mediterranean-style diet rich in whole grains, fish, nuts, berries, and healthy fats, alongside regular aerobic exercise. Research suggests these habits can help protect the brain, with studies indicating that high-intensity exercise may preserve dopamine-producing neurons and physical activity can trigger changes linked to reduced brain inflammation.