One Month In: What We Have Learned about Plastics and What We Are Still Trying to Figure Out

February 2, 2026

Our research journey is shifting how we think about plastic exposure and raising questions we didn't expect.

It's been one month since we launched Plastic Free Living, and most of that time has been spent down rabbit holes. Reading studies. Questioning assumptions. Realizing that some things I thought I understood were more complicated than I expected.

Before I get into it, I want to be upfront about something. I'm not a scientist or medical professional. What follows is how I'm making sense of the research I've been reading. I'm sharing this to help others think through these questions, not to tell anyone what's right for them. Take what's useful, leave what isn't.

We posted five research summaries during the month. We looked at nanoplastics versus microplastics, ingestion versus inhalation, whether there's actual evidence of health consequences, and whether accessible lab testing even exists for the stuff that might matter most. I want to take you through what we found and where our thinking has landed. Not as a neat summary, but as an honest look at a journey that's still very much in progress.

The Shift: Why I'm Now More Worried About Nanoplastics

I started this project lumping all small plastics together in my head. Microplastics, nanoplastics, whatever. Tiny plastic bits are bad. Simple enough.

That's not how the research reads. Size matters a lot.

Microplastics are generally defined as particles between 5mm and 1 micrometer. Nanoplastics are smaller than 1 micrometer. That size difference changes everything about how these particles interact with your body.

A 2025 study in Nature Communications using carbon-14 radiolabeled particles found that 20nm nanoplastics reached the brain in rats, while 100nm particles did not. Both crossed multiple biological barriers, but only the smallest particles made it to the most protected organ. Multiple research reviews confirm that nanoplastics can more readily cross cellular barriers in the skin, gut, and lungs to reach the bloodstream.

Here's how I've started thinking about it:

Particle Size	Likely Fate in Body
Larger microplastics (>10μm)	Mostly pass through GI tract and are excreted in feces
Smaller microplastics (1-10μm)	Some may cross into tissues; most still excreted
Nanoplastics (<1μm)	Can cross gut barrier, enter bloodstream, accumulate in organs
Smallest nanoplastics (<100nm)	Can cross blood-brain barrier, placenta; difficult to eliminate

The Food Packaging Forum summarized it well: membrane-crossing is mainly possible for smaller particles, and distribution studies show small particles are the most mobile in the body, accumulating in the spleen and liver.

This shifted my concern. I'm less worried about the microplastics we can actually detect and more worried about the nanoplastics we mostly can't.

Is There Actually Evidence of Harm?

This was a question I needed answered before going further. Is the concern about plastics in our bodies based on real evidence, or is it mostly speculation and precaution?

The honest answer: there's substantial evidence suggesting harm, but direct causal proof in humans doesn't exist yet.

Cell and animal studies have linked micro and nanoplastics to inflammation, oxidative stress, cellular damage, gut microbiome disruption, and endocrine disruption. Researchers have found microplastics in human blood, placenta, lungs, liver, and arterial plaque. A Stanford Medicine review from January 2025 noted that a large-scale UCSF analysis concluded exposure to microplastics is suspected to harm reproductive, digestive, and respiratory health, with suggested links to colon and lung cancer.

One study in particular stood out. Published in The New England Journal of Medicine in March 2024, researchers found that patients with microplastics detected in their arterial plaque had higher rates of cardiovascular events.

But I want to be careful here. As Harvard Medicine Magazine noted in November 2025, the study of whether and how microplastics pose threats to human health is still in its infancy. We can't run randomized controlled trials where we deliberately expose people to plastics. The ubiquity of plastic makes establishing clean causation extremely difficult.

Where I've landed: there's enough evidence to take this seriously and act on it, but not enough to make definitive claims about specific diseases or outcomes. I'm operating on the assumption that reducing exposure is worthwhile, while acknowledging the science is still developing.

Inhalation: The Route I Wasn't Thinking About

When I started this project, I was focused on food and drink. What containers we use, what we store things in, what touches our food. That's still important.

But the research kept pointing to something else: inhalation might be a bigger deal than I realized.

A 2026 review in Microplastics and Nanoplastics described inhalation as "a surprisingly efficient entry portal," noting that airborne nanoplastics are small enough to penetrate alveolar sacs in the lungs and gain direct access to the bloodstream. The alveolar surface area of your lungs is roughly 150 square meters with a tissue barrier less than 1 micrometer thick. Particles small enough to reach the deep lung can get into circulation easily.

This matters for how we think about harm reduction. Focusing only on food and drink misses a potentially significant exposure route. Indoor air, synthetic textiles, dust. These all contribute to what we're breathing.

The Lab Testing Disappointment

I went into this project hoping to eventually test products and environments to see what's actually working. Can we measure plastics in our tap water versus filtered water? In our air? In products we're considering?

For microplastics, the answer is yes. Testing exists and is reasonably accessible.

For nanoplastics, the answer is much more frustrating. The testing infrastructure isn't there yet. Standardized techniques for identifying and quantifying nanoplastics are still being developed. Stanford researchers are working on user-friendly portable devices, but they're not available yet.

This creates a real problem. If the research suggests nanoplastics are the bigger concern, but we can only easily test for microplastics, we're flying somewhat blind. We can't verify that our product swaps are actually reducing exposure to the particles that matter most.

This is an area where we're going to invest time building connections with researchers and organizations working to advance nanoplastic testing. It feels like an important gap to help close.

When Intuitive Swaps Backfire

One study from this month stopped me in my tracks. It's exactly why I think testing matters so much.

Researchers at ANSES, France's food safety agency, published a study in 2025 examining microplastic contamination across different beverage containers. The intuitive assumption: glass bottles would have less plastic contamination than plastic bottles.

The finding: glass bottles contained 5 to 50 times more microplastic particles than plastic bottles or metal cans.

The culprit wasn't the glass. It was the painted metal caps. The plastic-based paint coating on those caps sheds particles through friction during storage and transport. The particles found in the beverages matched the color and chemical composition of the cap paint.

Here's what the numbers looked like:

Container Type	Average Microplastics (particles/liter)
Glass bottles (soft drinks, beer)	~100
Plastic bottles	2-20
Metal cans	2-20
Glass with cork (wine)	0-5

This study has faced methodological criticism. A group of ecotoxicologists pointed out that the glass bottles in the study were generally smaller than the plastic ones, and normalizing results per liter may overemphasize contamination in smaller packages. The debate continues.

But the broader point stands regardless of that specific study's methodology. We can't assume that intuitive swaps are always better. Switching to glass with painted metal caps might not be the improvement it feels like. Without testing, we're guessing.

Where We Go From Here

We're pursuing two paths forward.

Path one: Harm reduction now. We're continuing to swap products around the house based on what seems likely to reduce exposure. Solid wood cutting boards instead of plastic. Evaluating food storage. Thinking about air quality and textiles. We'll share product reviews and what we're learning along the way.

Path two: Advancing the testing question. We're reaching out to researchers and organizations working on nanoplastic detection. If meaningful, accessible testing becomes available, it changes everything about how we can evaluate our choices. This is longer-term work, but it feels important.

We'll keep posting what we find. Hopefully some of it is useful to you as you figure out your own approach.