Microplastics were found in the liver and kidneys, but new study found brain concentrations were 7 to 30 times higher. The study, published in Nature Medicine, raises concerns about environmental plastic exposure and its potential health impacts.
A new study suggests that the average human brain may contain about 7 grams of plastic—the equivalent of a disposable spoon. Researchers at the University of New Mexico found a dramatic increase in microplastic levels in human brains between 2016 and 2024, with the highest concentrations in individuals with dementia.
Microplastics were also found in the liver and kidneys, but brain concentrations were 7 to 30 times higher. The study, published in Nature Medicine, raises concerns about environmental plastic exposure and its potential health impacts.
Most detected plastic particles were under 200 nanometers—small enough to bypass the blood-brain barrier. Scientists believe microplastics enter the body through food, water, and air. The brain’s high fat content may also attract these particles, much like grease clings to plastic containers.
While the long-term effects remain unclear, experts warn that microplastics could trigger inflammation, similar to asbestos in the lungs. The link between dementia and higher plastic levels is uncertain, but researchers suggest impaired brain clearance may play a role.
Children and older adults may be at greater risk, as their brain defenses are weaker. Although avoiding microplastics entirely is nearly impossible, reducing environmental plastic pollution could lower human exposure over time.
