Ontario: A recent study has revealed alarming evidence of microplastic and nanoplastic (MNP) accumulation in human brain tissue, with researchers estimating that the human brain contains plastic equivalent to a spoonful. Published in Brain Medicine, the study highlights a concerning link between microplastic exposure and neurological health.
According to the findings, individuals diagnosed with dementia exhibited microplastic levels three to five times higher than those without the condition. Additionally, brain tissues showed significantly greater concentrations of microplastics—7 to 30 times more—compared to other organs such as the liver and kidneys.
Dr. Nicholas Fabiano, a lead researcher from the University of Ottawa’s Department of Psychiatry, emphasized the rapid increase in brain microplastic concentrations between 2016 and 2024. "This dramatic rise mirrors the surge in environmental microplastic pollution,” he noted.
Particles smaller than 200 nanometers, primarily composed of polyethylene, were identified as a major concern. Due to their minute size, these particles can cross the blood-brain barrier, depositing in cerebrovascular walls and immune cells, potentially contributing to neurological disorders.
The study also suggests that simple lifestyle changes could significantly reduce microplastic exposure. Switching from bottled water to filtered tap water alone can lower intake from approximately 90,000 to 4,000 microplastic particles annually. Dr. Brandon Luu, an internal medicine resident at the University of Toronto, pointed out that bottled water alone can introduce nearly as many microplastics as all other inhaled and ingested sources combined.
Plastic tea bags were also identified as a major contributor, capable of releasing millions of microscopic plastic particles per brewing session. Additionally, heating food in plastic containers—particularly in microwaves—was found to release substantial amounts of MNPs.
To minimize exposure, researchers recommend avoiding plastic food storage and opting for glass or stainless steel alternatives. While these preventative measures may help, Dr. Luu stressed the need for further research to determine whether reducing microplastic intake can prevent its accumulation in human tissues.