There's a Spoonful of Plastic in Your Brain. Now What?
A conversation with Aidan Maguire of Plastic Pollution Coalition, part of the Plants Over Plastics Collective, our Plastic-Free July interview series.
We've been talking about plastic for fourteen years now, and we still get stopped in our tracks sometimes. This was one of those times.
Partway through filming this episode of Plants Over Plastics, Aidan Maguire, Business Partnerships Manager at Plastic Pollution Coalition, mentioned that the average human brain now contains an estimated 7 grams of plastic particles. That's roughly the weight of a plastic spoon. Sitting in the organ you're using to read this sentence.
We wanted to understand how we got here. So we asked. What follows is the short version of a long, generous conversation with someone who has spent years inside this issue, and who somehow left us feeling more hopeful, not less.
Plastic was a wartime invention looking for a peacetime market
One thing Aidan reminded us of early on: synthetics have existed for a blink of human history. Plastic was developed largely for military use during World War II. When the war ended, manufacturers had enormous production capacity and nowhere to point it, so they pointed it at us. The pitch was convenience. Why wash, mend, or reuse anything when you could simply throw it away?
That pitch worked. From the 1980s onward especially, plastic moved into nearly every industry on earth, including, yes, the humble hair tie.
The role of single use plastics for the industry
Roughly 99% of plastic is made from oil and gas. Fine, we knew that. But here's the number from Aidan that reframed things for us: about 40% of all plastic pollution comes from single-use packaging that the end consumer usually handles for less than a minute.
Sit with that. Nearly half the problem is material that exists, from your perspective, for seconds.
Aidan was careful to draw a line here. Plastic has genuinely necessary uses. Sterile medical equipment is the obvious one, and nobody serious is arguing we ban IV bags. The fight is with the unnecessary stuff, the single-use applications driving most of the environmental and health fallout while pretending to be unavoidable.
What's actually in your body
This is where the conversation got personal, because it turns out "the environment" includes the one inside your skin.
Researchers have identified an estimated 16,000 chemicals in plastic. More than 4,000 of them are considered hazardous to human health, and many of the rest remain understudied or barely regulated. Emerging research links plastic and microplastic exposure to autoimmune disease, certain cancers, infertility, and a growing list of reproductive health problems. One US study estimates that health conditions tied to plastic and petrochemical exposure cost the American healthcare system around $250 billion a year.
If you want to go deeper on the fertility research specifically, Aidan pointed us to the documentary Plastic Detox, now streaming on Netflix. More on that at the end, because he had a genuinely fun suggestion for what to do with it.
This research is also why we obsess over what sits against your skin all day. Your scalp is one of the most absorbent parts of your body, which is a strange place to saturate with chemicals. It's the reason our hair ties and scrunchies are made from certified organic cotton, fair trade natural rubber, and dyed with OEKO-TEX certified non-toxic dyes.
Why plastic stays so cheap
We asked Aidan the question a lot of conscious brands quietly chew on: how is plastic still cheaper than plant-based alternatives when extracting and refining fossil fuels takes so much?
His answer, in a word: subsidies. Oil and gas extraction receives massive direct and indirect subsidies worldwide. Individual petrochemical facilities in the US have each received over $100 million in tax breaks. Meanwhile, bio-based alternatives are often taxed at double the rate of their synthetic counterparts.
So when a plastic-free product costs more than its synthetic cousin, that's not the plant-based option being expensive. That's the plastic option being artificially cheap. The fight was never fair, and knowing that changes how "good value" should be measured. (We've written more about who gets to decide what good value is if you want the full soapbox.)
Aidan also flagged that as the world shifts toward renewable energy, the oil and gas industry is leaning harder into plastic production as its next major revenue stream. Plastic isn't quietly fading out; rather, it's being actively expanded. Which makes what we all choose to buy, and refuse to buy, more relevant, not less.
How to spot greenwashing on a label
This was one of the most immediately useful stretches of the conversation.
The chasing-arrows recycling symbol? It doesn't mean an item is recyclable. It never legally has. It's just a symbol that companies love to use, even if there is no means of actually recycling that good at a facility near you. Further, it's estimated that only 5% (7% if being generous) of all plastics are ever recycled. The whole recycling concept is one that's pushed actively by petrochemical giants - a topic we'll need to delve deeper on during our next conversation with Aidan.
"Bio-based" means a material comes from a renewable source like corn, hemp, or seaweed rather than fossil fuels. Sounds great. But bio-based doesn't automatically mean plastic-free. PLA, one of the most common bioplastics, is made from corn and sugar cane and still fragments into microplastics.
Aidan's advice is the test we'd encourage you to carry into every store: look past the word "bio" and ask what the material does at the end of its life. Does it safely return to organic matter, or does it just break into smaller and smaller pieces of the same problem? A KOOSHOO hair tie decomposes in 1 to 10 years. A conventional one outlives your great, great, great grandchildren.
Even the words are doing greenwashing
Here's something we couldn't stop noticing after this conversation. The industry's own vocabulary softens the picture before a single label gets printed.
Take "feedstock." Sounds agricultural, doesn't it? Something you'd give livestock. In reality, feedstock is simply the raw material fed into an industrial process to become plastic. Virgin feedstock means base chemicals like ethylene and propylene pulled from crude oil and natural gas.
Then there's the "petrochemical plant." That word plant is doing an enormous amount of quiet work. These facilities grow nothing. They process crude oil and gas into resin pellets called nurdles, which other manufacturers then mold into the plastic goods on your shelves. The "petrochemical" industry is just the middleman between the raw oil and gas, and the end product.
None of this is illegal or even unusual. The language predates the sustainability conversation entirely. But notice how much easier it is to accept an industrial process when its vocabulary borrows from a farm. Feedstock. Plant. The gap between the words and the reality is exactly the kind of thing worth training yourself to spot.
Sources: Atommek, Britannica, Prismecs, Imubit
Where to actually start
If the brain-spoon stat has you eyeing everything in your kitchen with suspicion, Aidan's starting points are refreshingly low-effort:
Avoid black plastic. Skip anything designed to be microwaved in its own packaging. Look for solid or powdered versions of things that usually come in liquid plastic bottles (shampoo bars, we see you). Bring your own bags to the farmers market. And favour things built to last over things built to be replaced.
None of it requires spending ten times more. Most of it is just buying better, less often. Which, if we're honest, has been the whole KOOSHOO thesis since day one.
Communicate through levity where possible. The poet, Tom Foolery, recently collaborated with Plastic Pollution Coalition on a wonderful, shareable spoken word poem worth a share on your socials.
Two things to take away
We asked Aidan what he'd want you to walk away with. He gave us two.
First: stop accepting waste as normal. It isn't. Using something for a few seconds and having it persist in the environment for centuries was never a reasonable trade, no matter how thoroughly we've all been talked into it.
Second, and this one's more fun: invite twenty people over, order some food, and watch Plastic Detox together. Especially the skeptics. Aidan told us his own family used to tease him as "the plastic police." These days they quietly report the products they've stopped buying without him saying a word. Change, it turns out, is contagious over dinner.
You can find Plastic Pollution Coalition's full Material Shift report and more of their research at plasticpollutioncoalition.org.
This interview is episode one of the Plants Over Plastics Collective, KOOSHOO's Plastic-Free July series. New episodes drop throughout July. Follow along at @feelingkooshoo on Instagram.