The article I read said Alzheimer patients had 10x the amount of plastics in the, compared to peoples ithput Alzheimers.

Edit: https://www.theguardian.com/environment/article/2024/aug/21/microplastics-brain-pollution-health

In the study, researchers looked at 12 brain samples from people who had died with dementia, including Alzheimer’s disease. These brains contained up to 10 times more plastic by weight than healthy samples.