WhatisMicroplastics

Most people are surprised how much microplastic comes from everyday items like water bottles, food containers, and clothing. Highest-impact swaps we cover: whatismicroplastics.com What's one product you've already switched away from plastic?

UNM researchers tested 62 donated placentas in 2024 and found microplastics in every single one. The average was about 127 micrograms per gram of tissue, and polyethylene, the plastic in bags and bottles, made up 54% of it. Honest caveat: some scientists now say fats in tissue can mimic polyethylene in this kind of test, so the exact numbers may come down. Finding it in all 62 is the part that sticks with me.

Hot take: "BPA-free" doesn't mean bisphenol-free. When BPA got a bad name, some makers swapped in its close cousins, BPS and BPF. A 2015 systematic review in Environmental Health Perspectives looked at 32 studies and found both had hormonal activity in the same range as BPA. Most of that work was in cells and animals, not people, but it's the same chemical family doing the same kind of thing. So the label tells you which bisphenol isn't in there, not whether one is. For anything that touches hot food or drinks, glass or stainless sidesteps the question entirely.

Coffee question for the daily drinkers: how do you actually brew yours? Drip machine, pods, French press, pour-over? I went looking and couldn't find a single automatic drip machine that's 100% plastic-free in the water path, so I'm curious what people really use. Anyone switch to a Chemex or a steel French press and actually stick with it?

Monday bathroom swap: your deodorant. The stick itself isn't the plastic problem, the tube is. Fast Company put the deodorant industry at over 15 million pounds of plastic waste a year. Two easy outs: a paperboard push-up tube (you push it up from the bottom with a finger, takes about a day to get used to) or a refillable case. One thing to check on "refillable": look at what the refills come in. Some still ship in plastic.

Most lab studies on microplastics use brand-new, pristine particles. That's not what we actually live with. A Rutgers team's systematic review out Oct 24 (ACS ES&T Toxicology) pulled together 17 studies on aged, weathered plastic, the sun-baked, oxidized kind. Aging changed the particles' surface chemistry, and it was often linked to more oxidative stress and inflammation than fresh particles. Fair caveat: most of the data came from cell dishes, with very little in humans. Still, it's why I don't keep the cloudy, scratched containers forever.

Your hot drink probably carries more plastic than your iced one. University of Birmingham researchers tested 155 drink samples from UK shops and cafes in 2025. Every single one had microplastics. Hot tea averaged about 60 particles per liter and hot coffee 43, vs 31 for iced tea and 37 for iced coffee. Their read: heat pulls more plastic out of the packaging. Brewing at home into a ceramic mug is the easy win.

Hot take: switching to glass bottles doesn't automatically mean fewer microplastics. France's food safety agency ANSES tested drinks sold in France in 2025. For soda, lemonade, iced tea and beer, glass bottles averaged around 100 particles per liter, roughly 5 to 50 times more than the same drinks in plastic bottles or cans. The culprit wasn't the glass. It was the painted metal caps. The particles matched the cap paint (a polyester), likely scuffed off as caps rubbed together in storage. Wine was the exception, because it's corked. Glass is still a great choice at home. Just know the cap is part of the package too.

Heat's on and the windows are shut until spring. Honest question: does anyone actually run a HEPA air purifier at home, and did you notice a difference? One Griffith University study found airborne microplastics were 1 to 28 times higher indoors than outside, so I'm curious where people put theirs. Bedroom or living room?

Sunday swap tip for chili season: if you use slow cooker liners, those are plastic bags. The big brand's liners are a heat-resistant nylon blend, sitting with your food at a simmer for 6 to 8 hours. The "BPA-free" on the box is true but kind of meaningless, since nylon isn't made with BPA in the first place (the fine print says so). The swap is boring: skip the liner, rub a little oil on the crock, and let it soak in hot soapy water after dinner. Ten minutes of scrubbing, no bag.

Hot take: the idea that plastic is "inert" is aging badly. A Columbia and UC Berkeley study in Nature this month found that when water touches tiny bits of plastic, the surfaces can form reactive oxygen species, the unstable molecules that damage cells. Polyethylene and polypropylene made the most. In mouse red blood cells, the plastics that made more of them did more damage. It doesn't prove this happens in people, and the authors say so. But it's a plausible reason smaller particles could matter more: break plastic down and the surface area explodes. I'd rather cut the tiny plastic in my food and water now than wait for the human data.

Base layer question now that it's actually getting cold: what do you wear under everything? Merino, polyester thermals, or just a cotton tee? I started reading tags and was surprised how many "merino" thermals are blends. One popular line was about 53% merino and 43% polyester. Has anyone found merino that doesn't itch or wear through in one season?