Hidden Alzheimer’s warning signs found in Parkinson’s patients without dementia

Researchers in Japan discovered that Parkinson’s patients diagnosed in their 80s are far more likely to show signs of amyloid buildup, a hallmark of Alzheimer’s, even without dementia symptoms. The study compared younger and older patients, finding that older individuals had three times the rate of amyloid positivity. Surprisingly, Parkinson’s patients overall showed lower amyloid buildup than healthy people their age, suggesting that Parkinson’s might change the way Alzheimer’s-related processes unfold in the brain.

source https://www.sciencedaily.com/releases/2025/09/250927031217.htm