Wellness, Actually with Emily Oster & Perry Wilson, MD What's the deal with microplastics?
Mar 19, 2026
A deep dive into how microplastics get into our bodies and where they come from. Discussion of lab versus human data and why evidence is messy. Exploration of major exposure routes like dust, bottled water, and food packaging. Practical tips for reducing everyday contact with plastics. Also covers recent news on leucovorin approval, AI triage limits, and a surprising college sexual health study.
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Microplastic Basics And Sources
- Microplastics are tiny plastic particles under 5 mm that come from breakdown of larger plastics and can become nanoplastics under 1 µm.
- They originate from degrading bottles, packaging, textiles, and household items and accumulate in water, soil, and organisms like fish.
Inflammation Is The Main Biological Concern
- Plastics can be biologically active without chemical reactions by provoking inflammation, similar to asbestos fibers.
- Lab studies show white blood cells respond to microplastics by releasing inflammatory cytokines and chemokines.
Lab Findings Don't Equal Human Harm
- Much of the microplastics literature is lab-based (cells, mice) and not directly translatable to human health outcomes.
- Review articles often chain-cite one another, creating speculative claims without new human data.