Microplastics: A Functional Medicine Approach to Quiet Inflammation

The headlines are alarming — and mostly accurate. Microplastics have been found in human brain tissue at concentrations higher than any other organ measured. They’re embedded in arterial plaque. They’re in the placenta, breast milk, and blood. A landmark 2024 study in the New England Journal of Medicine found that patients with microplastics in their carotid artery plaque had a 4.5-fold higher risk of heart attack, stroke, or death compared to those without. This isn’t speculative anymore. But the most damaging narrative isn’t the alarm — it’s the fatalism. The idea that because microplastics are everywhere, there’s nothing you can do. That conclusion isn’t supported by the evidence, and it’s not helpful.

We’ve covered endocrine disruptors in everyday products and how environmental toxins drive inflammation. Microplastics deserve their own look because the scale of exposure is different — and so are the strategies for managing it.

The real concern: it’s not just the plastic

Microplastics don’t arrive in your body empty. They carry whatever chemicals were added during manufacturing — BPA, phthalates, PFAS — plus whatever pollutants they’ve picked up from the environment. Plastic particles have a large surface area relative to their volume, making them efficient at concentrating heavy metals and persistent organic compounds. When those particles degrade in your tissues, the chemical cargo releases into surrounding tissue.

This is the “Trojan horse” dynamic. The plastic particle is the delivery vehicle. The chemical payload is the primary source of harm. BPA mimics estrogen, binding to receptors that govern reproductive function, thyroid activity, and metabolism. Phthalates interfere with testosterone synthesis. PFAS disrupt thyroid function and suppress immune response. We have decades of toxicology on these chemicals — the microplastics just deliver them more efficiently.

At the cellular level, the primary mechanism is oxidative stress. Microplastics and their additives generate reactive oxygen species, overwhelming your antioxidant defenses and leading to mitochondrial dysfunction, DNA damage, and chronic inflammation. A 2024 review in Life Sciences documented this oxidative stress pathway as the consistent mechanism across microplastic health effects, from cardiovascular disease to neurological damage.

Where they’re accumulating

A 2025 study in Nature Medicine found microplastics in human brain tissue, with concentrations roughly 50 percent higher in 2024 samples than in 2016 samples. The particles were concentrated in the myelin sheath around neurons and in perivascular spaces — areas around small brain blood vessels. In donors with documented dementia, plastic concentrations were three to five times higher than in those without.

Microplastics have also been found in arterial plaque, where the NEJM study linked them to dramatically worse cardiovascular outcomes. They cross the placental barrier, reaching developing fetuses. They’re in the gut, where systematic review data shows they shift microbiome composition, reducing diversity and beneficial bacteria while allowing pathogenic species to flourish.

What you can actually do

The goal isn’t complete elimination — that’s probably not achievable anymore. The goal is meaningful reduction in your total exposure and supporting your body’s ability to process what gets through.

Fix your water first. This is the single highest-leverage change. Bottled water contains substantially more microplastics than filtered tap water because the bottle itself is a continuous source. A reverse osmosis system with remineralization removes greater than 99 percent of microplastics, including nanoplastics. If a whole-house RO system isn’t practical, a countertop unit like the AquaTru or a Clearly Filtered pitcher independently tested to remove greater than 99.99 percent of microplastics is a meaningful step.

Switch your food storage. Replace plastic containers with glass or stainless steel. Don’t microwave food in plastic — heat accelerates particle release. Avoid plastic wrap in direct contact with food, especially fatty foods, which absorb more plasticizer chemicals.

Reduce indoor air exposure. Synthetic textiles — carpeting, upholstery, polyester clothing — shed microplastics into indoor air. If you can’t replace them, regular vacuuming with a HEPA filter and opening windows for ventilation helps. This is an underappreciated exposure route.

Filter your air if possible. A HEPA air purifier captures microplastic fibers and fragments. This is particularly important if you live in an urban environment or have synthetic flooring and furniture.

Supporting your detox pathways

Reducing exposure is half the equation. Supporting your body’s ability to process and clear what gets through is the other half.

NAC (N-acetylcysteine) is a precursor to glutathione, your body’s master antioxidant. Since the primary mechanism of microplastic harm is oxidative stress, supporting glutathione production directly addresses the downstream damage. A 2024 review in Antioxidants specifically evaluated antioxidant interventions against microplastic hazards and found NAC among the most promising protective compounds.

NAC 600mg — supports glutathione production and directly addresses the oxidative stress mechanism of microplastic damage.

Sulforaphane from broccoli sprouts activates the Nrf2 pathway — your body’s endogenous antioxidant defense system. This isn’t just neutralizing free radicals; it’s upregulating the enzymes that do the neutralizing. Raw broccoli sprouts are the richest source, but a supplement works if you can’t get them fresh.

Omega-3 fatty acids help maintain cell membrane integrity, which is directly relevant when nanoplastics are physically disrupting those membranes. The anti-inflammatory effects also counteract the chronic inflammation driven by microplastic accumulation.

Nordic Naturals Ultimate Omega — high-potency fish oil that supports cell membrane integrity and reduces the inflammatory signaling driven by microplastic exposure.

Fiber binds to microplastics and chemical additives in the gut, promoting excretion rather than absorption. A diverse, fiber-rich diet also supports the gut microbiome that microplastics are actively disrupting.

Organic Acacia Fiber Powder — a gentle prebiotic fiber that supports gut microbiome diversity and promotes excretion of environmental toxins.

Disclosure: These are affiliate links. We only recommend products with mechanism-relevant research.

What we still don’t know

The biggest gap is dose-response. We know microplastics are accumulating in human tissue. We know they carry harmful chemicals. We know the oxidative stress mechanism. What we don’t know is the precise threshold — how much accumulation, over what period, before clinical effects become significant. The NEJM study was observational, establishing association, not causation. The Nature Medicine brain study raised methodological questions about contamination controls that are still being resolved.

What we do know: the trend lines are moving in the wrong direction. Brain concentrations are rising. Exposure is increasing. And the chemical additives riding on these particles have well-established toxicological profiles. The precautionary case is strong — the biology is plausible, the interventions are beneficial for reasons beyond microplastics, and waiting for definitive proof means accepting more damage while we wait.

The fatalism isn’t warranted. Neither is the panic. What’s warranted is a practical, calibrated approach: reduce exposure where you can, support the pathways that process what gets through, and stop pretending this isn’t happening.

Someone you know is probably drinking from a plastic bottle right now. Send them this.