… brain tissue from people who had been diagnosed with dementia had up to 10 times as much plastic in their brains as everyone else, Campen said. But while there is a clear correlation, the study design cannot show whether higher levels of plastic in the brain caused the dementia symptoms – they may simply accumulate more due to the disease process itself, he said.
https://hsc.unm.edu/news/2025/02/hsc-newsroom-post-microplastics-human-brains.html