Microplastics and Dementia

You may have noticed that dementia is much worse today than it was in the past. Part of that is probably due to people living longer, but life expectancy has not increased enough to fully explain the growth rate of dementia. Perhaps there is a connection between microplastics and dementia.

Researchers from the University of New Mexico have found an amazing correlation between dementia and the concentration of microplastics in human brains. A study of specimens from autopsies found that the brains of people with dementia had as much as five times more microplastics than normal brains. Comparisons of brain tissues from 2016 and 2024 show 50% higher concentrations in the 2024 samples.

Global plastic production doubles every 10 to 15 years, so the problem is only going to get worse. The human brain is designed with a barrier between blood vessels and brain tissue, but some people have weak blood-brain barriers. Skeptics suggest there is a design failure in the human brain because it evolved by chance over time. A better explanation involves human failure to protect our health.

The fact is that pollution is apparently a significant cause of dementia. Like cancer, brain problems are linked to human greed and a failure to use what God has given us as a tool for successful living. Reducing the flow of microplastics into the environment is going to be an uphill battle because cheap alternatives to plastics are not available. Meanwhile, more studies are needed on the connection between microplastics and dementia.

— John N. Clayton © 2025

Reference: Nature Medicine at nature.com