Why your chopping board could be a hidden health hazard: Experts settle the wood versus plastic debate
Updated . First published
It's one of those kitchen staples you don't think twice about – until someone points out that the surface you prep every meal on could be dulling your knives, harbouring bacteria or even shedding material into your food.
Plastic has long been treated as the 'safe' option. Wood, on the other hand, has a reputation problem, often labelled porous, old-school and harder to keep clean.
But when you actually ask the people who work with these materials every day, the answer isn't so straightforward when it comes to chopping boards.
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Wood and plastic chopping boards both have drawbacks. Getty
We spoke to experts across manufacturing, food science and product design to unpack what really matters when it comes to your chopping board.
Is wood actually more hygienic?
The idea that plastic is automatically cleaner comes up again and again, though the science doesn't fully back it.
Simon Lissa, owner of The Cutting Board Company Australia, points to research that challenges that assumption.
"Multiple studies (including those done by the CSIRO) have clearly shown that wooden boards have lower bacterial counts than plastic ones," he told nine.com.au.
"Some of the reasons why; timber contains naturally occurring compounds like tannins, which inhibit bacterial growth, [and] wood fibres draw moisture and bacteria down into the board, away from the surface – this limits transfer back onto food during use.
"Once trapped in the wood's internal structure, bacteria tend to dry out and die rather than multiply."
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Wooden chopping boards aren't unhygienic, according to Dr Vincent. Getty Images/iStockphoto
Dr Vincent, a clinical nutritionist and food scientist, says the perception of plastic being cleaner comes down to how it looks – not how it behaves over time.
"While plastic starts off smooth and resistant to bacteria, it quickly develops knife marks with regular use.
"These lines and grooves can trap moisture, food particles and bacteria in a way that is difficult to fully remove, even with thorough washing.
"In contrast, wood behaves differently. Hardwood boards, particularly those made from species like maple, have a fibrous structure that can draw bacteria away from the surface and, in some cases, inhibit their survival.
"So, while wood may appear less 'clean' visually, it can perform surprisingly well from a microbiological perspective when properly maintained."
The part no one talks about: what ends up in your food
Every time you slice into a plastic board, something else is happening beneath the surface.
"Each time a knife cuts into a plastic board, small amounts of material are shaved off. These are typically microscopic fragments of polyethylene or polypropylene, and some of these particles can transfer onto food," Dr Vincent says.
"While the health impact of this exposure is still being studied, it raises an important point: We are becoming increasingly aware of microplastics in our environment, yet we may be generating them directly in our kitchens on a daily basis."
Choosing the right board is about more than just avoiding cross-contamination. Gado via Getty Images
What's worse for your knives?
Plastic is often sold as the gentler option – but that doesn't necessarily hold up.
"Plastic isn't better than wood for keeping knives sharp. In many cases, wood is actually better," Lissa says.
"Plastic gets worse over time. Knife cuts create grooves that stay open. These grooves increase friction and resistance. Over time, plastic boards can dull knives faster than timber.
"Wood 'self-heals', plastic doesn't. Wood fibres close back up slightly after cutting, keeping the surface smoother."
Dr Vincent agrees that wear pattern matters.
"As plastic boards wear, their surfaces can become rough and uneven, which may contribute to faster dulling of knife edges."
"High-quality wooden boards, particularly end-grain designs, are materially better because the wood fibres can separate under the blade and then close again, helping to preserve sharpness over time."
If you're investing in a good knife, your board choice plays a bigger role than most people realise.
And if you're using glass, stone or ceramic? Lissa doesn't mince words.
"The main offenders for dulling knives are: glass, stone, ceramic and steel."
Wooden chopping boards can be better for maintaining your knife blades. Getty
When your board becomes a problem
Plastic boards don't last forever, and there's a point where cleaning them won't cut it.
"Replace a plastic cutting board once the grooves are deep enough to catch your fingernail, as these grooves can trap bacteria beyond effective cleaning," Lissa says.
"Plastic boards are cheap; food poisoning isn't. If it's rough, toss it."
Dr Vincent echoes the same warning.
"Once a board develops deep cuts, pitting, or a roughened surface, it can harbour bacteria below the surface where cleaning methods, including dishwashing, are less effective.
"At that point, the board is no longer just worn, but potentially a hygiene risk."
"Replace a plastic cutting board once the grooves are deep enough to catch your fingernail." Getty
Why timber isn't as high-maintenance as you think
Timber boards often get written off as too much work – though that comes down to how they're used.
Cascie Heart, founder of Little Bread Winner, says hesitation is often based on misunderstanding.
"Timber is often misunderstood – while people assume it traps bacteria, well maintained hardwood boards have been shown to naturally inhibit bacterial growth, as they absorb and lock moisture away from the surface.
"They're also significantly gentler on blades, helping knives (and bread saws) stay sharper for longer. The key to timber is to keep it sanitised and conditioned properly."
Maintaining wooden chopping boards is key to keeping them suitable for long-term use. Getty
Plastic still has its place, she adds.
"Plastic boards are lightweight and easy to sanitise, which makes them popular in home settings. However, over time they can develop deep grooves that harbour bacteria, and there is a growing conversation around microplastic shedding with repeated use and wear which can be ingested. They also tend to dull blades more quickly."
Make sure your chopping board isn't actually a serving board. Getty
So are wooden chopping boards better than plastic?
There isn't a one-size-fits-all answer, Dr Vincent explains.
"I personally prefer plastic boards as they can be useful for handling raw meat, where thorough sanitisation is important and the knife movements are mostly slicing rather than hard chopping.
"Meanwhile, wooden boards are well suited to general food preparation, but make sure you get the right type of wood – for example, just because they look similar, a cheese board is not a cutting board."
But one thing matters most – how you maintain what you're using.
"Drying matters more than people think. Let boards fully air-dry upright, as moisture sitting in grooves is what bacteria love," Lissa adds.
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