Microplastics are getting more and more attention in the news, and rightly so. But there is an even smaller, less visible variant that now worries scientists more: nanoplastics. The reason is simple. The smaller the particle, the deeper it can penetrate the body. And that has direct consequences for what happens in your kitchen every day.
In this article you will read what the difference is between micro- and nanoplastics, why that difference matters so much, and which kitchen items play a role. Then we discuss what you can concretely change, without having to turn your kitchen upside down.
The difference between microplastics and nanoplastics: size determines the danger
Microplastics are plastic particles smaller than 5 millimetres. That already sounds small, but nanoplastics go a step further: particles below 1 micrometre, a thousandth of a millimetre. For comparison: a human hair is on average around 70 micrometres wide. Nanoplastics are a thousand times smaller than a human hair, and can therefore pass through cell membranes and organ walls that microplastics cannot reach.
Researchers at the Centre for Environmental Sciences (UHasselt, Belgium) put it clearly: it is certain that the smaller nanoparticles can pass through the cell membrane and are therefore absorbed into our cells. Microplastics more often get stuck in the gastrointestinal tract. Nanoplastics do not.
That makes the size of a particle more than a technical detail. It determines where it ends up in the body, how long it stays there, and what damage it may do.
Why are nanoplastics more dangerous than microplastics: three mechanisms
The concern about nanoplastics being more dangerous than microplastics revolves around three concrete properties that only apply to the very smallest particles.
They pass biological barriers
The body has several protective layers: the intestinal wall, the blood-brain barrier, and the placental barrier during pregnancy. Larger plastic particles are stopped by those layers. Nanoplastics simply pass through them. They have been found in human blood (Leslie et al., 2022, VU Amsterdam), in the placenta of pregnant women (Ragusa et al., 2021), in lung tissue and recently also in brain tissue.
A study by the University of New Mexico (2025) found amounts of plastic in brain tissue corresponding to roughly the weight of a plastic spoon per brain. The brains of people with dementia contained three to five times as much plastic as those of healthy controls. That does not mean plastic causes dementia, but it is a signal that science takes seriously.
They carry chemicals with them
Plastic is rarely pure. Manufacturers add plasticisers, colourants and stabilisers, some of which disrupt hormones. Nanoplastics take those substances with them as they move through the body. Laboratory research in the Netherlands (Utrecht University, presented at the MOMENTUM symposium) found indications of reduced gut function, inflammatory reactions and effects on hormone balance after exposure to plastic particles. Whether and to what extent this happens in humans at normal exposure is still being studied.
They are harder to measure and filter
A practical problem: nanoplastics are so small that standard measuring methods cannot detect them well. That means we are probably still underestimating how many are in circulation. A study by Columbia and Rutgers University (Qian et al., published in PNAS, 2024) used a new laser technique to measure plastic in bottled water. Result: on average around 240,000 plastic particles per litre, about 90 percent of which fell into the nanoplastic category. Earlier estimates, which could only measure microplastics, therefore missed by far the largest share.
Which kitchen items release nanoplastics?
The kitchen is one of the places where you come into daily and direct contact with plastic that wears, is heated or is worked on. That also makes it the place where you have relatively a lot of influence on your own exposure.
The plastic cutting board: an overlooked source
Researcher Himani Yadav of North Dakota State University investigated how many plastic particles are released when cutting carrots on polyethylene and polypropylene cutting boards, the two most common plastics for cutting boards. Her finding: with daily use, these boards can release tens of millions to almost eighty million plastic particles per year into food. Some of those particles fall into the nanoplastic category: not visible, but small enough to pass through cell membranes.
Australian research (University of Newcastle and Flinders University, Journal of Hazardous Materials, 2022) calculated that 100 to 300 micro- and nanoplastic particles per millimetre of cutting groove can be released per cut. In scratched areas, this rises to around 3,000 particles per square millimetre per cut. Every time you draw a knife across a damaged plastic board, you pass those particles straight on to the food you are preparing.
The cutting board is therefore one of the most direct food-contact sources of nano- and microplastics in the kitchen. More context on why experienced cooks are switching for this reason can be found in this article about the dangers of plastic cutting boards and microplastics.
Other plastic kitchen items
The cutting board is not the only source. Plastic spatulas and stirring spoons you use for baking and stir-frying are exposed to heat, which speeds up the release of particles. Plastic cups, containers and food boxes you put in the microwave do the same. Even cutting open plastic packaging releases a cloud of small particles, as research from 2020 showed.
An extensive overview of kitchen items that can spread nano- and microplastics can be found in this article about the top 10 items in your kitchen that spread microplastics.
Are nanoplastics more dangerous than microplastics: what does research say about health effects?
Science is honest about this: we do not yet know the full picture. What we do know is that micro- and nanoplastics are now found in places in the body where plastic should never have reached. Blood, lungs, placenta, artery walls and brain tissue. That they are there has been established. What they do there in the long term is still the subject of ongoing research.
The first clinical indications in humans are there. A study published in the New England Journal of Medicine (Marfella et al., 2024) followed patients who underwent surgery on the carotid artery. Patients with microplastics and nanoplastics in their artery wall had a significantly higher risk of heart attack and stroke than patients without. This is an association, not proof of cause and effect, but it is the first clinical study to establish a direct link in humans.
The Dutch RIVM concludes that micro- and nanoplastics are demonstrably present in human blood, lungs and the placenta, and has long advised the government to reduce exposure where possible. ZonMw, the Dutch health research organisation, published a renewed knowledge agenda in 2025 with a central message: micro- and nanoplastics very likely have effects in our cells, tissues and organs, but how serious and at what amounts requires further research.
The tone of science is not alarmist, but it is urgent. It is no reason to panic. It is a reason to switch off the sources you can switch off yourself.
Practical tips for a more plastic-free kitchen
You cannot avoid nanoplastics completely. They are in the air, in water, in packaging. But in the kitchen you have more control than you think. Small choices make the biggest difference, precisely because they come back every day.
Start with the cutting board
The cutting board is one of the easiest sources to replace. A stainless steel cutting board does not release plastic particles into food: stainless steel does not wear the way plastic does. The surface is non-porous, does not absorb odours and bacteria, and lasts for years with proper use without you ingesting any particles from it.
The TitanChef stainless steel cutting board is made of 304 stainless steel with a food-grade brushed finish. No plastic, no wear that ends up in your food. Both sides can be used, which makes it easy to keep raw meat and vegetables separate.
Replace plastic kitchen tools step by step
You do not have to replace everything in one go. A few concrete steps with immediate impact: choose a wooden or stainless steel spatula instead of plastic, avoid heating plastic containers and baking tins, and buy loose or in glass packaging where possible. Every step you take is one less source.
Be careful with heat
Heat speeds up the release of particles from plastic. Plastic in the microwave, plastic containers with hot food, plastic stirring spoons in a hot pan: all those situations release more particles than cold use. Keep hot food away from plastic where you can.
Why a stainless steel cutting board is the logical choice
If you look at the combination of hygiene, ease of maintenance and the absence of plastic release, microplastic-free use with a stainless steel cutting board takes centre stage. Stainless steel does not wear out, does not absorb liquids and withstands repeated use in the dishwasher. Scratches that become visible over time are purely cosmetic: they have no effect on hygiene or on the absence of plastic release.
Wood is also an option without plastic release, but needs more maintenance: regular oiling, no dishwasher, and care with the porous surface when used with raw meat. Bamboo is similar to wood, but sometimes contains glues that can come loose in damp conditions. Glass does not release plastic, but is impractical as a cutting surface and merciless on knives.
Stainless steel combines the absence of plastic release with a surface that is easy to keep clean, lasts a long time and needs no ritual to stay in good condition. For anyone who cooks every day and wants to remove the source of nano- and microplastics in the kitchen, that is the most direct step.
Frequently asked questions about whether nanoplastics are more dangerous than microplastics
What is the difference between microplastics and nanoplastics?
Microplastics are plastic particles smaller than 5 millimetres. Nanoplastics are much smaller still: particles below 1 micrometre, which is a thousandth of a millimetre. The difference in size sounds technical, but in practice it is crucial. Nanoplastics are so small that they can pass through cell membranes and therefore end up deeper in the body than microplastics.
Why are nanoplastics more dangerous than microplastics?
Nanoplastics are more dangerous than microplastics because their extremely small size allows them to pass biological barriers that normally protect the body. They can pass through cell membranes, cross the blood-brain barrier and end up in the placenta. Microplastics more often stay in the gastrointestinal tract; nanoplastics reach organs and tissues in a way that is not possible for larger particles.
Can nanoplastics penetrate cells and organs?
Yes. Researchers at UHasselt confirm that the smaller nanoparticles can pass through the cell membrane and are thus absorbed into our cells. The same particles have now been found in human blood, lung tissue, placenta and brain tissue. The exact long-term consequences are still being researched extensively, but their presence in those places is established.
Does a plastic cutting board release nanoplastics during cutting?
Yes. Research by North Dakota State University (Yadav et al., 2023) shows that polyethylene and polypropylene cutting boards can release tens of millions to almost eighty million plastic particles per year with daily use. Some of those particles fall into the nanoplastic category: too small to see, small enough to penetrate tissues. A stainless steel cutting board does not release plastic particles, because the material does not wear the way plastic does.
Which kitchen items release the most nano- and microplastics?
Plastic cutting boards are among the biggest kitchen sources of nano- and microplastics, together with plastic spatulas, stirring spoons and baking tins that are exposed to heat. Plastic packaging you cut open and plastic containers you heat in the microwave also release particles. The cutting board is particularly relevant because every cut on plastic means direct contact with food.
Can nanoplastics be filtered out of drinking water?
Ordinary water filter jugs remove some of the microplastics, but hardly filter out nanoplastics because those particles are smaller than the pores in the filter material. Reverse osmosis, a technique in which water is forced through a membrane with sub-nanometre pores, is more effective. However, removing nanoplastics completely from drinking water is difficult for the average consumer to achieve at home.
Which materials are safe replacements for plastic in the kitchen?
Stainless steel is one of the most practical alternatives: it does not wear the way plastic does and does not release plastic particles into food. Glass is also safe, but impractical as a cutting surface. Wood does not release microplastics, but is porous and needs regular maintenance. Bamboo sometimes contains glues that can come loose with moisture. Stainless steel scores strongest for daily use in terms of hygiene, ease of maintenance and the complete absence of plastic release.
Conclusion
Nanoplastics are more dangerous than microplastics, not because science has already fully mapped the consequences, but because their size allows them to go where larger particles cannot. They pass through cell membranes, the blood-brain barrier and the placental barrier. They have been found in blood, lungs, brains and artery walls. Science is still hard at work, but the direction is clear: the less plastic you take in through food every day, the better. A plastic-free cutting board is one of the most direct and easiest steps you can take in your kitchen.
Curious about the TitanChef stainless steel cutting boards? Take a look below. You will also find more blogs to read there.
