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How do plastics, including microplastics and plastic-associated chemicals, affect human health?
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Researchers Jeff Farner and Bukola Alimi are investigating the chemical and physical transformations that occur as plastic pollution weathers into microplastics and nanoplastics in the environment, tracking how particle properties change over time. Understanding the weathering process is critical because smaller nanoplastic particles exhibit greater biological uptake efficiency and may cross cellular barriers — including the gut, lung, and blood-brain barrier — at higher rates than larger microplastics.
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Researchers reviewing the latest evidence note that nanoplastics have been detected in human brain, lungs, arteries, semen, and placenta, raising urgent questions about health risks, though the full extent of harm from these body-wide accumulations remains poorly understood.
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Researchers and science journalists assess the state of evidence on microplastic health risks, noting that tiny plastic particles have been detected even in the human brain, but cautioning that the quality of scientific findings varies widely and that more rigorous research is needed before firm health conclusions can be drawn.
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