Microplastics May Build Up in the Brain More Than in the Kidneys or Liver

A recent study reveals that postmortem brain samples collected last year contain significantly more microplastics than those analyzed nearly a decade ago, suggesting these synthetic particles accumulate in vital organs over time.

Researchers led by University of New Mexico health scientist Alexander Nihart found higher concentrations of microplastics in brain tissue compared to kidneys and livers. Given that the liver and kidneys filter waste, their exposure to circulating particles should be greater. The brain, protected by the blood-brain barrier, was expected to have lower concentrations—yet it showed up to 30 times more plastic.

The Rising Threat of Microplastics: Widespread Contamination and Health Risks

Since 1950, over 9 billion metric tons of plastic have been produced, much of which has degraded into micro- and nanoparticles that now contaminate everything from archaeological remains to human tissues. The long-term health impacts remain uncertain, but emerging evidence suggests serious risks. Studies have linked microplastics in placentas to premature births and in mouse brains to blocked blood vessels. Additives in common plastics have also been associated with millions of deaths.

To investigate further, Nihart’s team analyzed tissue samples from 52 autopsies conducted in 2016 and 2024. Every sample contained plastic. When compared to earlier brain samples from 1997-2013, the data showed a clear increase over time, reflecting rising environmental contamination. Notably, brain samples from dementia patients had higher plastic concentrations, though it remains unclear whether microplastics contribute to neurodegeneration.

Despite growing concerns, research on the health effects of microplastics remains limited. Meanwhile, plastic production continues to rise. By 2040, plastics could account for 95% of net growth in oil demand, further exacerbating the issue. Scientists emphasize the urgent need for deeper investigation into how these persistent pollutants affect human health.

Read Original Article: Science Alert

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