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Bioaccumulation of microplastics in decedent human brains
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Researchers found microplastics in human brain, liver, and kidney tissue samples, with plastic levels significantly higher in samples from 2024 compared to 2016. The brain contained especially high levels of polyethylene, and brains from people with dementia had even more plastic accumulation. These findings suggest that microplastics are building up in human organs over time, raising urgent questions about potential health effects.
Rising global concentrations of environmental microplastics and nanoplastics (MNPs) drive concerns for human exposure and health outcomes. Complementary methods for the robust detection of tissue MNPs, including pyrolysis gas chromatography-mass spectrometry, attenuated total reflectance-Fourier transform infrared spectroscopy and electron microscopy with energy-dispersive spectroscopy, confirm the presence of MNPs in human kidney, liver and brain. MNPs in these organs primarily consist of polyethylene, with lesser but significant concentrations of other polymers. Brain tissues harbor higher proportions of polyethylene compared to the composition of the plastics in liver or kidney, and electron microscopy verified the nature of the isolated brain MNPs, which present largely as nanoscale shard-like fragments. Plastic concentrations in these decedent tissues were not influenced by age, sex, race/ethnicity or cause of death; the time of death (2016 versus 2024) was a significant factor, with increasing MNP concentrations over time in both liver and brain samples (P = 0.01). Finally, even greater accumulation of MNPs was observed in a cohort of decedent brains with documented dementia diagnosis, with notable deposition in cerebrovascular walls and immune cells. These results highlight a critical need to better understand the routes of exposure, uptake and clearance pathways and potential health consequences of plastics in human tissues, particularly in the brain.
More Papers Like This
Bioaccumulation of Microplastics in Decedent Human Brains Assessed by Pyrolysis Gas Chromatography-Mass Spectrometry
AI summary Read the abstract
Researchers analyzed autopsy samples and found that human brains contained significantly higher concentrations of microplastics than livers or kidneys, with polyethylene being the dominant type. Strikingly, microplastic levels in brain tissue increased substantially between samples collected in 2016 and 2024, suggesting that human brain exposure to microplastics is rising over time.
Microplastics in brains … and other research
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Scientists found tiny plastic fragments, called microplastics and nanoplastics, in human brain samples, with higher amounts in samples from 2024 than from 2016, and even higher levels in people who had dementia. This doesn't prove plastics cause dementia or other brain diseases, but it's a concerning trend that researchers say deserves more study, especially since these plastic particles seem to be building up in our bodies over time.
Post-mortem evidence of microplastic bioaccumulation in human organs: insights from advanced imaging and spectroscopic analysis
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Researchers examined tissue samples from deceased individuals and found microplastics in the brain, liver, thyroid, kidney, heart, muscle, and lungs, with the thyroid, kidney, and brain showing the highest contamination at up to 40 particles per gram of tissue. Nanoscale plastic particles smaller than 0.02 micrometers were also detected, indicating that the tiniest plastics can cross biological barriers and accumulate deep in human organs.
Bioaccumulo di microplastiche e nanoplastiche nel cervello umano
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This study examines the growing body of evidence on microplastic and nanoplastic accumulation in the human brain. Researchers note that a 2025 study in Nature Medicine found brain concentrations approximately 10 times higher than in liver and kidneys, with levels doubling over an eight-year period. The evidence indicates a potential correlation between high plastic concentrations in brain tissue and dementia, though more research is needed to establish causation.
Microplastics detection in freshly harvested human brain tissues of northeast Chinese postmortem donors and their correlation with Alzheimer's disease-related pathological proteins.
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Researchers examined brain tissue from 16 deceased donors in northeast China and found microplastics, including polyethylene, PVC, polystyrene and polypropylene, in all samples. Higher levels of two plastic types were linked to higher amounts of a protein associated with Alzheimer's disease, though this does not prove the plastics caused the protein changes.
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