Chop enough carrots on a plastic board and you're not just cutting food, you're cutting the board. A 2023 study measured exactly how much of it ends up on your plate: up to 50 grams of microplastic a year, about the weight of ten credit cards, sliced straight off the surface and into whatever you just prepared.
We build the Bedrock's cutting surface out of 316 marine-grade stainless for the same reason we use it instead of ageing plastic for hygiene: it isn't plastic, so this particular problem doesn't exist on it. Here's what the actual research says, including the parts that deserve a caveat.
The study that measured it
Researchers chopped carrots on polyethylene and polypropylene boards, the two plastics almost every budget cutting board is made from, then directly counted and weighed the particles that came off. A single chopping session produced between 1,536 and 7,680 microplastic fragments, most of them smaller than a tenth of a millimetre and invisible to the naked eye.
Extrapolated to a year of ordinary home cooking, that works out to 7.4 to 50.7 grams from a polyethylene board and up to 49.5 grams from polypropylene. Polypropylene, the harder, glossier plastic often marketed as the sturdier option, actually sheds 5 to 60% more by weight and up to 71% more by particle count than the softer polyethylene.
Estimated microplastic shed, per year of normal use
Grams per year · based on Cao et al., Environmental Science & Technology, 2023
It's not just the weight
Grams is an easy number to print, but it undersells what's actually happening. That 50 gram figure corresponds to somewhere between 14.5 and 71.9 million individual plastic particles a year from a polyethylene board, and up to 79.4 million from polypropylene. The harder you chop, and the more resistance you're cutting against, a carrot rather than an empty board, the more comes off. It isn't a fixed leak. It's proportional to how much the board actually gets used, which is exactly the problem with a tool you're meant to reach for every day.
What happens after you eat it
This is where we want to be careful rather than alarmist. A 2024 study simulated cutting-board-level microplastic exposure in mice and found measurable intestinal inflammation and disruption to gut microbiota. That's a real, published finding, and it's also a mouse study, not proof of a specific outcome in a person.
The wider picture is that microplastics from all sources, packaging, water, textiles, air, not cutting boards alone, have been turning up in human blood, lung tissue and elsewhere across a growing body of research through 2024 and 2025. Cutting boards aren't the whole story here. They're one measurable, entirely avoidable contributor to it, which is a more useful way to think about it than treating any single kitchen tool as the culprit.
Why wood and steel don't have this problem
The honest answer is almost too simple: they're not plastic. Nothing can shed microplastic off a surface that was never plastic to begin with. It's the same underlying property that makes stainless the more hygienic choice over an ageing, knife-scored plastic board too. A rigid, non-porous, non-degrading surface doesn't break down into your food the way a softer plastic does under a blade.
There's nothing in a steel surface that can end up in your food.
Common questions
How much microplastic does a plastic cutting board actually shed?
A 2023 study in Environmental Science & Technology found up to 50.7 grams a year from a polyethylene board and up to 49.5 grams from polypropylene, roughly ten credit cards' worth of plastic, based on directly measuring particles released while chopping.
Is polypropylene or polyethylene worse?
Polypropylene, despite often being marketed as the sturdier, more premium plastic, sheds 5 to 60% more microplastic by weight and up to 71% more by particle count than polyethylene in the same study.
Do wood or stainless steel boards shed microplastic?
No. Microplastic shedding is specific to plastic boards, since the particles are, by definition, plastic. Wood and stainless steel can't shed something they were never made of.
Is ingesting microplastic from a cutting board proven to cause health problems?
Not specifically in humans, no. A 2024 study found intestinal inflammation in mice exposed to cutting-board-level microplastic, but that hasn't been demonstrated in people yet. The wider research on microplastics in the human body, found in blood, lung tissue and elsewhere, is real and growing, but it covers every source of exposure, not cutting boards alone.
If cutting boards are only one source among many, does switching actually help?
Yes, in the sense that it's a fully avoidable one. You can't easily remove packaging or air from your daily exposure, but you can remove a plastic surface you're actively dragging a blade across every time you cook.