A New Study; Microplastics Have Penetrated the Human Brain

A recent study shows that healthy human brains contain microplastic particles equivalent to a disposable plastic spoon. These findings, published in the medical journal 'Nature', are based on brain samples from individuals who were autopsied in two time frames, 2016 and 2024. Dr. Matthew Campen, a professor at the University of New Mexico and one of the lead authors of the study, states, 'We found a concentration of 4800 micrograms of plastic per gram of brain tissue or 0.48% by weight in the brain samples of individuals with normal cognitive function, with an average age of about 45 to 50 years. This amount is roughly equivalent to a standard plastic spoon.' According to this study, recent brain samples contained 50% more plastic than samples taken in 2016, indicating an increasing trend of plastic infiltration into human body tissues. Researchers also found that brain samples from individuals with dementia contained three to five times more microplastics than healthy samples. These particles have settled in the walls of the brain's arteries and veins, as well as in the brain's immune cells. Thus, the studied individuals had 99.5% brain and 0.5% plastic. However, research has not yet definitively shown whether the presence of these particles in the brain causes harm. Dr. Campen explains, 'These findings are somewhat concerning, but we must be very cautious in interpreting these results because the increase in microplastics could be due to dementia, and we currently cannot say that microplastics are the cause of this disease.' Phoebe Stapleton, an assistant professor at Rutgers University who did not participate in this study, says, 'It is unclear whether these particles are circulating and entering and exiting the brain, or if they accumulate in neural tissues and lead to disease. More research is needed to understand how these particles interact with cells and whether this interaction has toxicological consequences.' Meanwhile, Dr. Philip Landrigan from Boston College emphasizes that finding high levels of microplastics in human tissues is logical because plastic production, plastic pollution, and human exposure to plastic are rapidly increasing. He adds, 'More than half of all plastics ever made have been produced since 2002, and production is expected to double by 2040.' Microplastics are small pieces of degraded polymers found in the environment, including water, air, and soil, and previous studies have also shown that these materials have entered the human body.