Your plastic cutting board is shedding into dinner

September 15, 2026

The Journal · Kitchen · September 2026

A 2023 study measured what a knife shaves off a plastic cutting board. Roughly half of it ends up in the food. Here is what the grooves are, and why stainless steel is the boring, correct answer.

There is a piece of research doing the rounds again this month, and it deserves the attention. In 2023 a university research team chopped carrots on ordinary plastic cutting boards and measured what came off. The answer, published in Environmental Science & Technology, was that a household using a polyethylene board could be exposed to somewhere between 7 and 50 grams of microplastic a year. It has been picked up widely in the press since, which is probably why your feed has been full of people throwing out their white boards.

7–50 g

Estimated annual microplastic exposure from a single polyethylene cutting board in normal household use. About half of what the knife releases stays in the food.

Environmental Science & Technology, 2023

What the knife is actually doing

Every cut on a plastic board leaves a groove. Look at a board that has been in a drawer for a year and you can see them: a grey haze of scratches across the middle, darker where the raw chicken went. Each of those grooves is plastic that isn't on the board any more. Some of it went into the bin with the offcuts. Some of it went into dinner.

The grooves are also the reason old plastic boards smell. Plastic is porous once it's scored, and the scores hold onion, garlic and meat juice in a way soap and a sponge don't reach. Wood has the same problem for a different reason; it absorbs, then dries, then absorbs again, and eventually splits along the grain.

Why steel is the boring, correct answer

304 stainless steel doesn't shed. It isn't porous, so there's nothing for bacteria to sit in, and it doesn't take on smell. It goes in the dishwasher. It doesn't warp when it's left wet in the sink overnight, and it doesn't crack. The trade-off people worry about is knives, and it's fair: a hard surface will dull an edge faster than end-grain wood. In practice it means sharpening a little more often, against a board that doesn't need replacing.

Stainless Steel Chopping Board — The Chopping Board's folded lip hooks over the benchtop edge, so it stays put while you work.

Ours comes two ways. The Stainless Steel Cutting Board is a flat sheet with a hanging hole, the size of a standard plastic board, and the one to keep on the bench for everyday prep. The Stainless Steel Chopping Board has a folded lip that hooks over the front edge of the benchtop so it can't slide while you're working, and comes in two sizes. If you break down whole chickens or roast joints, that's the one.

What to do with the old board

Don't sand it back; that makes it worse. Cut it down for the garage or the potting bench, where nobody is eating off it, and let the steel one take over inside. If you cook for people who are older, pregnant or very young, this is one of the easier swaps to make.