Microplastics vs PFAS vs BPA: What's the Difference and Which Should You Worry About?

Online wellness culture has flattened “toxins in plastic” into one fear blob. These are three separate problems with three separate sources, three different exposure routes, and three different reduction strategies. Microplastics are tiny solid particles. PFAS are a class of synthetic chemicals used for water and grease resistance. BPA is a single industrial chemical used to make hard plastic and can liners. Knowing which is which lets you make the changes that actually matter for your situation.

What microplastics actually are

Microplastics are solid plastic fragments between 1 micrometer (µm) and 5 millimeters (mm). Smaller particles (under 1 µm) are called nanoplastics. They come from:

• Secondary microplastics, larger plastic items breaking down: bottles, packaging, tires, paint, textiles.
• Primary microplastics, manufactured small: microbeads in cosmetics (now mostly banned in US), plastic pellets, glitter.
• Textile fibres, polyester / nylon clothing sheds during washing and wearing.
• Container shedding, bottles, takeout, plastic cookware, scratches.

They enter the body through ingestion (water, food) and inhalation (indoor and outdoor air). Confirmed detection sites in humans now include blood, placenta, lung tissue, liver, testes, breast milk, and arterial plaque.

See: nanoplastics vs microplastics and microplastics in the brain.

What PFAS actually are

PFAS (per- and polyfluoroalkyl substances) are a class of about 15,000 synthetic chemicals known for resisting water, grease, heat, and stains. The most-studied are PFOA and PFOS (legacy chemicals largely phased out in the US but still in the environment), and newer replacements like GenX.

Common PFAS sources:

• Non-stick cookware (PTFE / Teflon), releases more at high heat or when scratched.
• Stain- and water-resistant fabrics (Gore-Tex, Scotchgard, Stainmaster carpet, some athletic wear).
• Fast-food wrappers and microwave popcorn bags, grease-resistant treatments.
• Drinking water, many US municipal supplies have detectable PFAS (EPA designated PFOA/PFOS hazardous in 2024).
• Cosmetics, some long-wear / waterproof products contain PFAS.

PFAS persist in the human body for years (PFOA half-life ~3 years, PFOS ~5 years). The C8 Health Project (Ohio Valley cohort) and other studies link PFAS to liver damage, thyroid dysfunction, immune suppression, kidney and testicular cancer, higher cholesterol, preeclampsia, and lower birth weight.

See: PFAS in dental floss and nanoplastics vs microplastics.

What BPA (and BPS / BPF) actually are

Bisphenol-A (BPA) is one specific industrial chemical used to:

• Make polycarbonate plastic (#7), hard clear plastic; old baby bottles, 5-gallon water jugs.
• Make the epoxy resin liner of metal food cans.
• Coat thermal printer paper (receipts) for color development.

BPA is an endocrine disruptor, it mimics estrogen and binds to estrogen receptors in the body. It clears from the body within hours through urine, but ongoing daily exposure keeps levels steady. The FDA banned BPA in baby bottles and sippy cups in 2012 but allows it in many other food contact applications.

“BPA-free” products often use BPS (bisphenol-S) or BPF (bisphenol-F) instead, both show similar endocrine activity in lab studies. “BPA-free” is a real improvement over old polycarbonate, but doesn't mean bisphenol-free.

Where they overlap in food packaging

Practical reduction, all three at once

1. Filter your drinking water with a PFAS-rated filter, granular activated carbon block (Clearly Filtered, Epic, Hydroviv) or reverse osmosis (AquaTru, Waterdrop). Removes 80-99% of microplastics AND most PFAS. Big multi-target win.
2. Replace non-stick (PTFE) cookware with stainless, cast iron, or enameled cast iron. Eliminates PFAS + cookware-side microplastic shedding.
3. Switch food storage to glass. Glass solves microplastic shedding and any BPA / BPS concern.
4. Skip thermal receipts, request digital or decline the receipt. BPA / BPS absorbs through skin within seconds.
5. Avoid fast-food wrappers and microwave popcorn bags, both common PFAS sources.
6. Skip canned acidic foods (tomato, soup, citrus); pick glass-jarred or fresh. Acid pulls the most chemistry out of the liner, whatever the liner is made of.
7. Never microwave plastic. Solves microplastic + BPS / BPA migration in one step.
8. Scan food packaging with the MicroPlastics app, addresses material and condition risk specifically.

What we do not claim

• We do not claim that microplastics, PFAS, or BPA at typical exposure levels cause specific diseases in specific individuals.
• We do not provide medical advice. Health concerns should be discussed with a physician.
• We do not claim that any single product (including a scanner app) eliminates exposure, only that informed choices reduce it.
• We do not claim that “BPA-free” is the same as “chemical-free.”
• We do not claim that filtering water removes all PFAS, only that PFAS-rated filters significantly reduce common compounds.
• We use published peer-reviewed research and government agency reports as our evidence base. We link the sources so you can read them yourself.

Related reading: nanoplastics vs microplastics, is BPA-free plastic actually safe?, canned food, best non-toxic cookware, water filters compared, and the regulatory side in the EU microplastics ban.