A recent study published in the top international journal *Nature Medicine* has sparked global discussion. A team from the University of New Mexico, through in-depth analysis of brain tissue samples from 91 human autopsies, estimated that the total weight of microplastic fragments in the brains of healthy deceased individuals in 2024 would be approximately 6-7 grams, roughly equivalent to the weight of a typical plastic spoon. This conclusion has brought to the forefront concerns about microplastics infiltrating core brain tissue and prompted a re-examination of the potential health threats posed by plastic pollution.
Published on February 3, 2025, this study employed a multi-step, high-precision detection process: first, organic matter in brain tissue was dissolved using potassium hydroxide solution; then, insoluble substances were separated by ultracentrifugation; and finally, components were identified using pyrolysis gas chromatography-mass spectrometry and Raman spectroscopy. Microplastics were detected in all samples, and its core findings far exceeded the single value of "7 grams":
(I) The content is showing an accelerating growth trend.
Comparing brain tissue samples from 2016 and 2024, the microplastic content in the human brain increased by approximately 50% in just eight years. This growth curve closely matches the trend of global plastic production doubling every 10-15 years, suggesting that the continuous accumulation of microplastics in the environment is increasingly penetrating the human body, and the rate of penetration is gradually accelerating.
(II) Abnormally high content in dementia patients.
In the 12 confirmed dementia cases included in the study, the total amount of microplastics in the brain reached 34-36 grams, which is 5-6 times that of the general population. More importantly, these microplastics are not randomly distributed, but rather accumulate in large quantities around the walls of blood vessels and glial cells (brain immune cells) in patients' brains, forming a significant "targeted aggregation" effect. This provides important clues for exploring the link between microplastics and neurological diseases.
(III) Composition and Morphology Point to Everyday Plastic Pollution
The test results show that 75% of the microplastics in the brain are polyethylene-the world's most produced type of plastic, widely used in disposable food packaging, plastic shopping bags, cling film, and other everyday items. Morphologically, these microplastics are not the smooth spheres commonly seen in laboratories, but rather irregular fragmented nanoparticles of 100-200 nanometers. This structure makes them more likely to penetrate biological barriers and may enhance their interaction with cells. Deep Warning: Plastic Pollution is
Approaching the Core Area of Human Health
Regardless of the limitations of the research, its greatest value lies in the fact that it is the first time that rigorous scientific data has confirmed that microplastics can enter the human brain, and their content is rapidly increasing. This discovery overturns the perception that "the harm of microplastics is limited to the environmental level," revealing that plastic pollution has infiltrated from the external environment into the most core organs of the human body, becoming a potential health risk that cannot be ignored.
(I) Daily exposure to microplastics is ubiquitous.
Humans are exposed to microplastics almost everywhere:
drinking tap water and bottled water contaminated with plastic particles;
consuming seafood (such as fish and shellfish) and crops (such as vegetables and grains) that have absorbed microplastics;
breathing air containing microplastic fibers (from synthetic fiber clothing and the degradation of plastic waste);
and using daily chemical products such as toothpaste and facial cleansers containing plastic microbeads.
After these microplastics enter the human body, they may gradually migrate through the blood circulation and lymphatic system. Previous studies have confirmed their presence in human blood, lungs, liver, kidneys, and other organs. The detection in the brain further confirms their "systemic infiltration" characteristics.
(II) Addressing plastic pollution is urgent.
Although the specific harm of microplastics in the human brain has not yet been determined, this study undoubtedly sounds an alarm for humanity. Reducing the use of plastic products, promoting plastic recycling, developing environmentally friendly alternative materials, and strengthening the control of microplastic pollution are not only necessary for protecting the ecological environment, but also an inevitable choice for safeguarding human health.
In the future, there is an urgent need to conduct more interdisciplinary (environmental science, medicine, neuroscience), large-sample, long-term follow-up studies to clarify the specific mechanisms by which microplastics enter the brain, their long-term effects on the nervous system, and feasible intervention measures, providing a scientific basis for addressing this potential health risk.
Conclusion: The estimate of "7 grams of microplastics" may not be a globally universal conclusion, but it serves as a mirror, reflecting the profound threat of plastic pollution to human health. From the environment to the human body, from organs to the brain, the penetration pathways of microplastics continue to extend, forcing humanity to accelerate its green transformation-only by reducing plastic pollution at its source can we build a solid defense for our own health.
