Take your cutting board out of the cupboard and hold it flat under a light. Tilt it until the surface catches.
You will see the grooves. Everyone does. Most of us have looked at them a hundred times and thought it’s fine, it still works. Here is the part almost nobody thinks about: every one of those grooves is plastic that used to be on the board and isn’t anymore. It did not evaporate. It went somewhere. For years that was where the conversation ended, because nobody had measured it. Then somebody did.
The study
What the 2023 research actually did
Researchers published a study in Environmental Science & Technology, a peer-reviewed journal of the American Chemical Society, titled “Cutting Boards: An Overlooked Source of Microplastics in Human Food?”
They did not theorise. They chopped — different plastics, with carrots and without, across five people’s chopping styles — then counted and weighed what came off.
Estimated annual exposure, one person, one polypropylene board
79.4 million
microplastic particles a year
49.5 grams
of plastic a year — roughly the weight of a golf ball
Polypropylene, the most common plastic board in home kitchens, shed 14–71% more particles than polyethylene, the other common board plastic. So the number depends on which one is in your kitchen — and most people have no idea which they own.
Source: Yadav et al., Environmental Science & Technology (2023). DOI: 10.1021/acs.est.3c00924
The honest part
The study measured exposure, not harm
It measured how much plastic comes off and reaches food. It did not measure health effects, and the science on what ingested microplastics do inside the body is still being worked out. Anyone telling you this study proves your board is making you ill has not read it.
But you do not need a health claim to look at 49 grams a year and decide you would rather not. It is your dinner.
Does the dishwasher help?
No. Heat and detergent clean the surface; they do not fill the grooves back in and they do not put the missing plastic back. A board that comes out looking spotless has exactly as much material gone as when it went in.
What actually reduces it
Three options, and only one removes the mechanism
Glass and stone shed nothing either — and destroy knife edges doing it. Most people who want to keep their knives sharp end up on wood. If you are weighing the options properly, we compared all of them in wood vs plastic vs bamboo: the best cutting board material.
The upgrade
Why end grain is the construction that lasts
An end-grain board is built the way butcher blocks have been built for over a century: the wood fibres stand upright, so the blade slips between them instead of grinding across them. The surface closes back up behind the knife rather than filling with permanent grooves — which is exactly the failure mode plastic cannot escape.
Acacia adds the rest: a dense, naturally water-resistant hardwood, thick enough to stay planted on the counter while you work. Keep it sealed with an occasional coat of food-grade mineral oil and it outlives a decade of disposable plastic.
Keep reading
Related guides
Are Plastic Cutting Boards Safe? The Microplastics Problem
When Should You Replace a Cutting Board?
Best Cutting Board for Meat and Carving
Good to know
Frequently asked questions
How many microplastics does a plastic cutting board release?
The 2023 Environmental Science & Technology study estimated roughly 79.4 million particles and about 49.5 grams per person per year from a polypropylene board. Polyethylene boards shed 14–71% less. These are modelled annual exposure figures, not a measurement taken from any one kitchen.
Is it dangerous to use a scratched plastic cutting board?
The study measured how much plastic reaches food, not what it does once ingested — that question is still open in the research. What is established is that deep grooves also trap food residue and moisture that washing does not reach, which is a hygiene reason to retire a board regardless.
Do wooden cutting boards shed anything?
Wood loses tiny amounts of wood fibre with use, not plastic. On an end-grain board the fibres close back up behind the blade, so the surface does not accumulate permanent open grooves the way plastic does.
Ready to get the plastic off your counter?
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Study referenced: Yadav et al., “Cutting Boards: An Overlooked Source of Microplastics in Human Food?”, Environmental Science & Technology, 2023, DOI 10.1021/acs.est.3c00924. This article is for general information and isn’t medical advice. Research on microplastics and human health is ongoing.