A recent study revealed the ability of microplastic particles (microplastics) to penetrate the blood-brain barrier and collect in deep areas of the human brain, especially in individuals suffering from dementia.
The researchers examined 52 donated human brains and discovered traces of polyethylene and other types of polymers in all the samples. They noticed a significant increase in the concentration of these substances in the 2024 samples compared to the 2016 samples, which indicates a continuing increase in exposure to plastic.
Plastic buildup
The study also revealed that the brains of dementia patients contain three to five times more plastic than those found in the brains of others. However, scientists emphasize that this discovery does not yet prove a direct causal relationship.
The study also indicated the presence of microplastics in other organs such as arteries, kidneys and placenta. Meanwhile, animal experiments have shown a link between exposure to these molecules, inflammation and subtle changes in memory.
The research, published in Nature Medicine, found no relationship between the amount of microplastic and the age of the deceased, which surprised the research team. The researchers intend to conduct further studies to determine the groups most at risk.
Although there is no conclusive evidence of its direct impact on brain function in humans, researchers warn of the increasing production of plastic globally, and call for more studies and action to reduce plastic pollution.
