The Invisible Bill · Episode 11 of 12 · 26 min
Everywhere and In Everything
In 2024 Italian surgeons found plastic fragments in arterial plaque, and patients who had it were about four and a half times more likely to have a heart attack, stroke, or death. Microplastics have also been reported in blood, placenta, breast milk, and the brain. The episode lays out real associations and mechanisms while stressing that causation, dose, and measurement methods remain uncertain.
Who's who
- Raffaele MarfellaItalian internist; lead author of the 2024 carotid-plaque study
- Matthew CampenUniversity of New Mexico toxicologist behind brain, placenta, and testes studies
- Alexander NihartFirst author of the 2025 Nature Medicine brain study
- Heather LeslieEcotoxicologist who first quantified plastics in human blood
- Antonio RagusaRome obstetrician who reported microplastics in placenta and breast milk
- Richard ThompsonMarine biologist who coined the term microplastics in 2004
- Oliver JonesAnalytical chemist skeptical of the brain study's method
- Julio CordanoChilean diplomat chairing the stalled plastics treaty talks
Where it happens
- Campania, ItalyRegion of the carotid-plaque surgical cohort
- Busan, South KoreaPlastics treaty round failed here in late 2024
- Geneva, SwitzerlandResumed treaty round collapsed in August 2025
- Sargasso SeaSite of the first ocean plastic particle reports in 1972
Timeline
- 2004Richard Thompson coins the term "microplastics."
- December 2020Researchers identify 6PPD-quinone, a tire chemical, as killing coho salmon.
- March 2022175 nations mandate a legally binding global plastics treaty.
- March 2024The NEJM carotid-plaque study reports a hazard ratio of 4.53.
- February 2025A Nature Medicine study reports plastic in human brains.
- August 2025The resumed Geneva treaty round ends without an agreement.
Still debated
The brain study's figures are formally disputed over contamination controls and lipid interference, and the 4.5 times heart-risk result is an association, not proof of causation. Methods disagree by orders of magnitude, and higher brain levels in dementia could reflect reverse causation.