The complete guide to microplastics and endocrine disruptors

The questions people actually bring us.

What are endocrine-disrupting chemicals?

Endocrine disruptors are compounds that interfere with the body's hormone system, either by mimicking natural hormones, blocking them, or altering how they're produced and metabolized. The Endocrine Society's 2015 position statement lists hundreds of confirmed or suspected EDCs, including BPA, phthalates, PFAS, parabens, and many pesticides. The dose-response relationship is often non-monotonic, meaning low doses can produce effects that higher doses don't.

How much microplastic is actually inside us?

More than anyone expected a decade ago. Ragusa et al. 2021 (Environment International) detected microplastics in 4 of 6 human placentas tested. Schwabl et al. 2019 (Annals of Internal Medicine) found plastic particles in every stool sample across 8 participants from 8 countries. Leslie et al. 2022 found microplastics in 77% of blood samples. Marfella et al. 2024 (New England Journal of Medicine) documented microplastics in carotid artery plaque and linked their presence to a 4.5x higher cardiovascular event rate over 34 months. The exposure is documented. The mechanism is still under investigation.

Are microplastics causing cancer?

The honest answer: we don't know yet, and the research isn't conclusive either way. Microplastics act as carriers for other compounds (plasticizers, flame retardants, heavy metals), some of which are known carcinogens. The particles themselves cause inflammation in cell and animal studies. Epidemiological evidence in humans is still too new to draw causal conclusions. Treating exposure reduction as sensible precaution, not as an acute threat, is the defensible position.

What's BPA-free actually mean?

It means the container doesn't contain bisphenol A, the specific compound that got phased out after 2000s research. It usually means the manufacturer substituted BPS or BPF instead. A 2015 study in Environmental Health Perspectives (Rochester & Bolden) found BPS has estrogenic activity similar to BPA. 'BPA-free' is a negative claim, not a positive one. 'Bisphenol-free' or 'no bisphenols' is the stronger label.

What are the highest-impact things I can do?

In order of impact per dollar: (1) Don't microwave food in plastic. This is free and the exposure reduction is measurable. (2) Switch from plastic to glass or stainless for hot and acidic foods. (3) Install a water filter rated for PFAS removal. (4) Replace non-stick cookware with stainless, cast iron, or enameled cast iron. (5) Reduce canned food in favor of dry or jarred. Everything else is tier two or three.

Should I be worried about phthalates in personal care?

Worth paying attention to, particularly in products that touch skin daily. Phthalates are listed on ingredient labels as 'fragrance' or 'parfum' often, which means you can't see them. DEP, DBP, and DEHP are the most studied. A 2018 study in JAMA Internal Medicine (Chiu et al.) linked urinary phthalate metabolites to altered thyroid hormone levels in pregnant women. Switching to fragrance-free or EWG Skin Deep verified products is the cleanest path.

Is there a test I can take to measure my exposure?

Commercial blood tests for PFAS and phthalate metabolites exist but are expensive and hard to interpret. Quest Diagnostics and LabCorp offer them with a physician order; direct-to-consumer panels from companies like Million Marker exist for phthalates. The results are informative but rarely actionable. Knowing your phthalate number is high doesn't change the intervention, which is still to reduce exposure. For most people, skipping the test and making the swaps is the better use of resources.

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