A 2024 study found that human brain samples collected at autopsy contained significantly more microplastics than those collected eight years earlier. “The concentrations we saw in the brain tissue of normal individuals...were 4,800 micrograms per gram, or 0.5% by weight,” said lead author Matthew Campen of the University of New Mexico. This is about 50% higher than 2016 levels, suggesting that modern brains are “99.5% brain and the rest is plastic.” However, the study doesn’t clarify whether this increase in microplastics results in brain damage. Phoebe Stapleton from Rutgers University noted that “further research is needed” to determine if these particles have toxic effects on the brain.
The study found that brain tissue had 7 to 30 times more plastic particles than the kidneys and liver. Nanoplastics, the smallest and most concerning type, were predominantly found in the brain. These particles, often as small as 100 to 200 nanometers, can cross the blood-brain barrier. “Plastics love fats, or lipids...one theory is that plastics are hijacking their way with the fats we eat,” Campen explained.
Polyethylene, commonly used in plastic bags and bottles, was the predominant plastic found in brain tissue. This type of plastic is associated with the release of harmful chemicals like 1,4-dioxane, which is considered possibly carcinogenic.
Despite the alarming findings, experts urge caution. Pediatrician Dr. Philip Landrigan stated, “It’s important not to scare the hell out of people...nobody in the year 2024 is going to live without plastic.” He suggests reducing exposure where possible, such as avoiding plastic bags and bottles, and using alternatives like cloth bags and glass containers. “There is a lot you can do,” Landrigan emphasized, encouraging individual action to reduce plastic use.
Link: CNN
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