Microplastics can increase your risk of heart attack, stroke, or...
Nick Norwitz MD PhD@nicknorwitz
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Nov 24, 2025
~3 min read
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Microplastics can increase your risk of heart attack, stroke, or death by 350%. (Yes, that's a heart)
1/7) This isn’t a theoretical projection. This is the conclusion of a landmark study published in the New England Journal of Medicine.
For decades, we have categorized plastic pollution as an "environmental" problem—a tragedy for the oceans, but distant from clinical medicine.
This paper shattered that assumption. It redefines microplastics as an immediate, acute cardiovascular threat.
But there’s hope, and a way to shield our bodies from the inside…
🔗 in 7/7
*P.S. In the coming video, I have acquired an actual heart for demonstration purposes… although I thought I’d get in trouble for stealing a human heart from the lab… so we have a cow heart.
1/7) This isn’t a theoretical projection. This is the conclusion of a landmark study published in the New England Journal of Medicine.
For decades, we have categorized plastic pollution as an "environmental" problem—a tragedy for the oceans, but distant from clinical medicine.
This paper shattered that assumption. It redefines microplastics as an immediate, acute cardiovascular threat.
But there’s hope, and a way to shield our bodies from the inside…
🔗 in 7/7
*P.S. In the coming video, I have acquired an actual heart for demonstration purposes… although I thought I’d get in trouble for stealing a human heart from the lab… so we have a cow heart.
2
2/7) First, the researchers recruited 257 patients undergoing a carotid endarterectomy.
Of the 257 patients analyzed, 58.4% had detectable microplastics or nanoplastics embedded directly within their excised plaque tissue.
The researchers followed these patients for an average of 34 months and tracked a "primary end point" composed of myocardial infarction (heart attack), stroke, or death.
Patients with plastics in their plaque suffered these catastrophic events at a rate 4.53 times higher than those without plastics.
That is a ~353% increase in risk.
Of the 257 patients analyzed, 58.4% had detectable microplastics or nanoplastics embedded directly within their excised plaque tissue.
The researchers followed these patients for an average of 34 months and tracked a "primary end point" composed of myocardial infarction (heart attack), stroke, or death.
Patients with plastics in their plaque suffered these catastrophic events at a rate 4.53 times higher than those without plastics.
That is a ~353% increase in risk.
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3/7) But why does chemically inert plastic cause heart disease? Using Electron Microscopy, the researchers peered inside the plaque tissue to visualize the interaction.
They observed jagged, foreign particles (the micro- and nano-plastics) sequestered within macrophages scattered throughout the plaque.
Macrophages are the "garbage trucks" of the immune system. When they encounter these microplastics, they attempt to do their job: they engulf the particle.
However, unlike biological debris, these plastic shards are indigestible.
(Makes me think of raw kale – sorry… I had too)
The microscopy revealed jagged, sharp-edged particles lodging inside the these immune cells.
They observed jagged, foreign particles (the micro- and nano-plastics) sequestered within macrophages scattered throughout the plaque.
Macrophages are the "garbage trucks" of the immune system. When they encounter these microplastics, they attempt to do their job: they engulf the particle.
However, unlike biological debris, these plastic shards are indigestible.
(Makes me think of raw kale – sorry… I had too)
The microscopy revealed jagged, sharp-edged particles lodging inside the these immune cells.
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4/7) Think of this pathology like stepping on a Lego—but happening continuously, at a cellular level, inside your arterial wall. When the macrophage fails to digest the plastic, it becomes "frustrated."
This mechanical irritation triggers a biochemical cascade. The frustrated cell begins screaming inflammation into the surrounding tissue, releasing cytokines and inflammatory markers. Inflammation is the fuel for plaque growth, instability, and worse cardiovascular outcomes.
The plastic turns the plaque into a ticking time bomb.
This mechanical irritation triggers a biochemical cascade. The frustrated cell begins screaming inflammation into the surrounding tissue, releasing cytokines and inflammatory markers. Inflammation is the fuel for plaque growth, instability, and worse cardiovascular outcomes.
The plastic turns the plaque into a ticking time bomb.
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5/7) The macroeconomic context suggests this risk is not disappearing; it is accelerating. Global plastic production is currently on a trajectory to quadruple by 2050.
Microplastics have now been detected in the deepest trenches of the ocean, the pristine snow of Antarctica, human placentas, and now, the plaque of heart patients. This ubiquity forces a difficult realization: Complete avoidance is becoming statistically impossible.
You can filter your water and avoid polyester clothing, but you cannot boycott the air you breathe or the water cycle itself. The "external" environment has become fundamentally micro-plasticized.
This demands a paradigm shift in how we approach health...
Microplastics have now been detected in the deepest trenches of the ocean, the pristine snow of Antarctica, human placentas, and now, the plaque of heart patients. This ubiquity forces a difficult realization: Complete avoidance is becoming statistically impossible.
You can filter your water and avoid polyester clothing, but you cannot boycott the air you breathe or the water cycle itself. The "external" environment has become fundamentally micro-plasticized.
This demands a paradigm shift in how we approach health...
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6/7) If we cannot ensure zero exposure, we must focus on internal resilience.
We need to shift our focus from solely "stopping the influx" to "upregulating the defense."
This is where the story takes a turn. New innovations, including microplastic binding bacteria/probiotics are here!
staycuriousmetabolism.substack.com/p/microplastic…
We need to shift our focus from solely "stopping the influx" to "upregulating the defense."
This is where the story takes a turn. New innovations, including microplastic binding bacteria/probiotics are here!
staycuriousmetabolism.substack.com/p/microplastic…
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7/7) For a more detailed breakdown and new information on a product I'm helping to develop to protect against microplastics from the inside, see today's letter! staycuriousmetabolism.substack.com/p/microplastic…
