Scientists warn microplastics in the brain may be tied to mental health issues and call for urgent dietary and medical interventions.
A groundbreaking set of four papers in the May issue of Brain Medicine brings together growing evidence that microplastics from ultra-processed foods may be building up in human brains and possibly playing a role in the global rise of depression, dementia, and other mental health disorders.
Together, the papers offer the most detailed analysis so far of how these tiny plastic particles could be harming brain health through several interconnected biological processes.
The Plastic Spoon in Your Brain
The striking cover of Brain Medicine’s May 2025 issue shows a human brain dotted with colorful microplastic particles next to a plastic spoon. This image highlights a key finding: human brains may contain about “a spoonful” of microplastic material. All four articles in the special issue explore this unsettling idea in detail, including a peer-reviewed commentary titled “Human microplastic removal: what does the evidence tell us?”
The featured peer-reviewed viewpoint article builds on earlier commentary and brings together new evidence to present a hypothesis linking ultra-processed food consumption, microplastic exposure, and mental health outcomes.
“We’re seeing converging evidence that should concern us all,” explains Dr. Fabiano. “Ultra-processed foods now comprise more than 50% of energy intake in countries like the United States, and these foods contain significantly higher concentrations of microplastics than whole foods. Recent findings show these particles can cross the blood-brain barrier and accumulate in alarming quantities.”
The Mental Health Connection
The researchers present strong evidence linking ultra-processed food consumption to negative mental health outcomes. A recent umbrella review published in The BMJ found that individuals who consumed ultra-processed foods had a 22 percent higher risk of depression, a 48 percent higher risk of anxiety, and a 41 percent higher risk of poor sleep.
What makes their hypothesis especially compelling is the new proposal that microplastics—tiny plastic particles less than 5 millimeters in size—may be the missing link in this connection. The researchers highlight concerning data showing that foods like chicken nuggets contain 30 times more microplastics per gram than chicken breasts, emphasizing the effects of industrial food processing.
Their case is further supported by recent findings published in Nature Medicine, which revealed alarming concentrations of microplastics in the human brain. According to the researchers, the levels amounted to approximately “a spoon’s worth” and were three to five times higher in individuals diagnosed with dementia.
Shared Mechanisms of Harm
“This hypothesis is particularly compelling because we see remarkable overlap in biological mechanisms,” notes Dr. Marx. “Ultra-processed foods have been linked to adverse mental health through inflammation, oxidative stress, epigenetics, mitochondrial dysfunction, and disruptions to neurotransmitter systems. Microplastics appear to operate through remarkably similar pathways.”
The viewpoint article raises an intriguing question: Could the microplastic content of ultra-processed foods be partially responsible for their observed negative mental health effects? To study this relationship more systematically, the authors propose the development of a Dietary Microplastic Index (DMI) to quantify exposure through food consumption.
Possible Removal Pathways
Complementing the viewpoint article is a peer-reviewed Brevia research paper by Dr. Stefan Bornstein and colleagues. This paper, also published in the May issue, examines preliminary evidence that extracorporeal therapeutic apheresis—a technique that filters blood outside the body—may have the potential to remove microplastic particles from human circulation.
“While we need to reduce our exposure to microplastics through better food choices and packaging alternatives, we also need research into how to remove these particles from the human body,” notes Dr. Bornstein. “Our early findings suggest that apheresis might offer one possible pathway for microplastic removal, though much more research is needed.”
A Call to Action
The issue is further contextualized by a powerful guest editorial by Dr. Ma-Li Wong, which frames the collection of papers as not just a scientific warning but a paradigm shift in how we must think about environmental contaminants and brain health.
“What emerges from this work is not a warning. It is a reckoning,” writes Dr. Wong. “The boundary between internal and external has failed. If microplastics cross the blood-brain barrier, what else do we think remains sacred?”
The authors of all four papers emphasize that while more primary research is needed, their analyses add another dimension to the growing case for reducing ultra-processed food consumption and developing better methods to detect and potentially remove microplastics from the human body.
“As the levels of ultra-processed foods, microplastics, and adverse mental health outcomes simultaneously rise, it is imperative that we further investigate this potential association,” concludes Dr. Fabiano. “After all, you are what you eat.”
References:
“Human microplastic removal: what does the evidence tell us?” by Fabiano, Luu, and Puder, 4 March 2025, Genomic Medicine.
DOI: 10.61373/bm025c.0020
“Microplastics and mental health: The role of ultra-processed foods” by Fabiano, Luu, Puder, and Marx, 20 May 2025, Genomic Medicine.
DOI: 10.61373/bm025v.0068
“Therapeutic apheresis: A promising method to remove microplastics?” by Bornstein et al., 20 May 2025, Genomic Medicine.
DOI: 10.61373/bm025l.0056
“Una cuchara de plástico en tu cerebro: The calamity of a plastic spoon in your brain” by Wong, 20 May 2025, Genomic Medicine.
DOI: 10.61373/bm025g.0062
Never miss a breakthrough: Join the SciTechDaily newsletter.
Follow us on Google and Google News.
3 Comments
Plastics in brain: I have heard this on other videos and elsewhere and it is scary. Younger generations are without hope, as they have been exposed to plastics since they were born. My generation had glass baby bottles and food was stored in jars or glass bowls. Some dishes had lead paint but were taken off the market.
Obstacles to environmental progress were indeed quite formidable pre-pandemic. But Covid-19 not only stalled most projects being undertaken, it added greatly to the already busy landfills and burning centers with disposed masks and other non-degradable biohazard-protective single-use materials.
Too many people continue throwing non-biodegradable garbage down a dark chute or flush pollutants down toilet/sink drainage pipes as though they’re inconsequentially dispensing that waste into a black-hole singularity where it’s compressed into nothing.
This was especially reflected in the astonishingly entitled and short-sighted selfishness I observed about eight years ago when a TV news reporter randomly asked a young urbanite wearing sunglasses what he thought of government restrictions on disposable plastic straws. He retorted with a snort that it is like he’s “living in a nanny state that’s always telling me what I can and cannot do”.
His carelessly entitled mentality revealed why so much gratuitous land-and-sea life-destroying plastic waste eventually finds its way into the natural environment, where there are few, if any, caring souls to immediately see it. Sadly, he’s far from being alone.
Also, increasingly problematic is the very large and growing populace who are too overworked, worried and even rightfully angry about food and housing unaffordability for themselves or their family — all while on insufficient income — to criticize various industries for the environmental damage they cause, particularly when it’s not immediately observable to the masses.
How does science miss the most scientific process ever, fasting?
Fasting detoxes the body by utilizing foreign materials as fuel to preserve the body’s tissues.
Typically, westerners when they fast for the first time will smell bad and have bad breath, that is the body detoxing. The more you fast, the more the body can eliminate.
Even animals know that when they are sick, don’t eat.
I laugh when all these “smart” people miss the simplest things.