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Microplastics

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6 factors with evidence, ordered from highest to lowest effectiveness. Information, not medical advice.

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Microplastics are everywhere: in the food we eat, the water we drink, and the air we breathe; one estimate suggests we may be consuming the equivalent of a credit card's weight in plastic every week just through our daily routine, a reality that, however alarming it may seem, is backed by a growing body of studies detecting these particles in organs, tissues, and body fluids that a few years ago were considered completely sterile.

Microplastics are fragments of plastic or other polymer-based materials ranging from 5 mm down to just 100 nanometers, at which point they are called nanoplastics; they contain multiple chemicals harmful to humans, including BPA, phthalates, flame retardants, and other plasticizers that can interfere with the endocrine system, promote inflammation, and alter cell function, with an estimated human exposure of 39,000 to 52,000 particles per year through diet, which can rise by 90,000 additional particles in those who drink exclusively bottled water versus only 4,000 in those who drink tap water.

Cardiovascular impact: the most alarming evidence

One study found microplastics in the atherosclerotic plaques of 257 patients who had them surgically removed; more than half (58.4%) had microplastics in their plaques, and patients with microplastics in them were 4.53 times more likely to have a cardiovascular event during the three-year follow-up than those without, which represents an increase in cardiovascular risk of a magnitude similar to that of some of the best-known classic risk factors.

Another study in patients undergoing cardiac surgery found microplastics in cardiac tissue samples, including the atrial myocardium and the pericardium, and a third study demonstrated the presence of microplastics in thrombi removed from 30 patients undergoing arterial or venous thrombectomy in the brain, heart, or legs, with high concentrations particularly in thrombi from deep vein thrombosis of the calf, suggesting that microplastics could contribute directly to clot formation.

Brain, endocrine system, and how to reduce exposure

Microplastics and nanoplastics can cross the blood-brain barrier and accumulate in brain tissue, where they cause neuroinflammation, microglial dysfunction, and oxidative stress; studies in mice show that exposure to polystyrene nanoparticles for several weeks produces significant cognitive impairment comparable to accelerated aging, and markers of brain microplastic accumulation in humans appear to correlate with neurological conditions including dementia and cerebrovascular disease.

To reduce exposure, the strategies best supported by the evidence include: choosing filtered tap water over bottled water; reducing the use of single-use plastics, especially in contact with hot or acidic foods; using glass, stainless steel, or ceramic containers to store and heat food; avoiding highly processed foods that have been in prolonged contact with plastic packaging; and regularly ventilating enclosed spaces, since indoor air can contain up to ten times more microplastics than outdoor air.

References

  1. 10.1016/j.ebiom.2024.105118
  2. Microplastics in arterial plaques and cardiovascular events. doi:10.1056/NEJMoa2309822
  3. Microplastics in human heart tissue. doi:10.1016/j.chemosphere.2023.137969
  4. Microplastics in blood clots. doi:10.1093/eurheartj/ehae244
  5. Nanoplastics cross blood-brain barrier. doi:10.1021/acs.nanolett.2c04822
  6. Polystyrene nanoparticles impair cognitive function in mice. doi:10.1016/j.jhazmat.2023.132044

In depth

*⏱ 2 min read

Microplastics are everywhere: in the food we eat, the water we drink, and the air we breathe; one estimate suggests we may be consuming the equivalent of a credit card's weight in plastic every week just through our daily routine, a reality that, however alarming it may seem, is backed by a growing body of studies detecting these particles in organs, tissues, and body fluids that a few years ago were considered completely sterile.

Microplastics are fragments of plastic or other polymer-based materials ranging from 5 mm down to just 100 nanometers, at which point they are called nanoplastics; they contain multiple chemicals harmful to humans, including BPA, phthalates, flame retardants, and other plasticizers that can interfere with the endocrine system, promote inflammation, and alter cell function, with an estimated human exposure of 39,000 to 52,000 particles per year through diet, which can rise by 90,000 additional particles in those who drink exclusively bottled water versus only 4,000 in those who drink tap water.

Cardiovascular impact: the most alarming evidence

One study found microplastics in the atherosclerotic plaques of 257 patients who had them surgically removed; more than half (58.4%) had microplastics in their plaques, and patients with microplastics in them were 4.53 times more likely to have a cardiovascular event during the three-year follow-up than those without, which represents an increase in cardiovascular risk of a magnitude similar to that of some of the best-known classic risk factors.

Another study in patients undergoing cardiac surgery found microplastics in cardiac tissue samples, including the atrial myocardium and the pericardium, and a third study demonstrated the presence of microplastics in thrombi removed from 30 patients undergoing arterial or venous thrombectomy in the brain, heart, or legs, with high concentrations particularly in thrombi from deep vein thrombosis of the calf, suggesting that microplastics could contribute directly to clot formation.

Brain, endocrine system, and how to reduce exposure

Microplastics and nanoplastics can cross the blood-brain barrier and accumulate in brain tissue, where they cause neuroinflammation, microglial dysfunction, and oxidative stress; studies in mice show that exposure to polystyrene nanoparticles for several weeks produces significant cognitive impairment comparable to accelerated aging, and markers of brain microplastic accumulation in humans appear to correlate with neurological conditions including dementia and cerebrovascular disease.

To reduce exposure, the strategies best supported by the evidence include: choosing filtered tap water over bottled water; reducing the use of single-use plastics, especially in contact with hot or acidic foods; using glass, stainless steel, or ceramic containers to store and heat food; avoiding highly processed foods that have been in prolonged contact with plastic packaging; and regularly ventilating enclosed spaces, since indoor air can contain up to ten times more microplastics than outdoor air.

References

  1. 10.1016/j.ebiom.2024.105118
  2. Microplastics in arterial plaques and cardiovascular events. doi:10.1056/NEJMoa2309822
  3. Microplastics in human heart tissue. doi:10.1016/j.chemosphere.2023.137969
  4. Microplastics in blood clots. doi:10.1093/eurheartj/ehae244
  5. Nanoplastics cross blood-brain barrier. doi:10.1021/acs.nanolett.2c04822
  6. Polystyrene nanoparticles impair cognitive function in mice. doi:10.1016/j.jhazmat.2023.132044
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Microplastics: the invisible threat

*⏱ 2 min read

Microplastics are everywhere: in the food we eat, the water we drink, and the air we breathe; one estimate suggests we may be consuming the equivalent of a credit card's weight in plastic every week just through our daily routine, a reality that, however alarming it may seem, is backed by a growing body of studies detecting these particles in organs, tissues, and body fluids that a few years ago were considered completely sterile.

Microplastics are fragments of plastic or other polymer-based materials ranging from 5 mm down to just 100 nanometers, at which point they are called nanoplastics; they contain multiple chemicals harmful to humans, including BPA, phthalates, flame retardants, and other plasticizers that can interfere with the endocrine system, promote inflammation, and alter cell function, with an estimated human exposure of 39,000 to 52,000 particles per year through diet, which can rise by 90,000 additional particles in those who drink exclusively bottled water versus only 4,000 in those who drink tap water.

Cardiovascular impact: the most alarming evidence

One study found microplastics in the atherosclerotic plaques of 257 patients who had them surgically removed; more than half (58.4%) had microplastics in their plaques, and patients with microplastics in them were 4.53 times more likely to have a cardiovascular event during the three-year follow-up than those without, which represents an increase in cardiovascular risk of a magnitude similar to that of some of the best-known classic risk factors.

Another study in patients undergoing cardiac surgery found microplastics in cardiac tissue samples, including the atrial myocardium and the pericardium, and a third study demonstrated the presence of microplastics in thrombi removed from 30 patients undergoing arterial or venous thrombectomy in the brain, heart, or legs, with high concentrations particularly in thrombi from deep vein thrombosis of the calf, suggesting that microplastics could contribute directly to clot formation.

Brain, endocrine system, and how to reduce exposure

Microplastics and nanoplastics can cross the blood-brain barrier and accumulate in brain tissue, where they cause neuroinflammation, microglial dysfunction, and oxidative stress; studies in mice show that exposure to polystyrene nanoparticles for several weeks produces significant cognitive impairment comparable to accelerated aging, and markers of brain microplastic accumulation in humans appear to correlate with neurological conditions including dementia and cerebrovascular disease.

To reduce exposure, the strategies best supported by the evidence include: choosing filtered tap water over bottled water; reducing the use of single-use plastics, especially in contact with hot or acidic foods; using glass, stainless steel, or ceramic containers to store and heat food; avoiding highly processed foods that have been in prolonged contact with plastic packaging; and regularly ventilating enclosed spaces, since indoor air can contain up to ten times more microplastics than outdoor air.

References

  1. 10.1016/j.ebiom.2024.105118
  2. Microplastics in arterial plaques and cardiovascular events. doi:10.1056/NEJMoa2309822
  3. Microplastics in human heart tissue. doi:10.1016/j.chemosphere.2023.137969
  4. Microplastics in blood clots. doi:10.1093/eurheartj/ehae244
  5. Nanoplastics cross blood-brain barrier. doi:10.1021/acs.nanolett.2c04822
  6. Polystyrene nanoparticles impair cognitive function in mice. doi:10.1016/j.jhazmat.2023.132044