A recent study highlights that regular use of plastic packaging and kitchen tools can release tiny particles into our food and drinks. It outlines scientific findings while offering practical suggestions to reduce exposure to these microplastics in our daily lives without needing to overhaul our routines.
The researchers examined various products and everyday actions, like opening a cap or steeping a tea bag. They also created an open dashboard that allows anyone to explore the presence of these particles and the testing methods used.
Microplastics in food packaging
The lead researcher, Lisa Zimmermann from the Food Packaging Forum in Zurich, collaborated with teams from Eawag in Switzerland and the Norwegian University of Science and Technology. They evaluated 103 studies, most of which detected plastic particles (microplastics or nanoplastics) in foods or liquids that encountered plastic packaging or utensils.
The study documented the testing methods and the rigor of each study in managing contamination. Yet, only seven studies were deemed reliable enough to answer the essential question about particle release during typical usage. About a third of those utilized a kinetic approach, measuring how particle levels changed over time, temperature, or repeated use.
“This is the first systematic evidence map to explore the role of normal and intended use of food contact articles in the contamination of food with microplastics,” Dr. Zimmermann noted.
How microplastics get into food
Microplastics refer to plastic particles ranging from 1 to 1000 micrometers, while nanoplastics are even smaller, making them trickier to detect. Items in direct contact with food—like bottles, caps, bags, wraps, and utensils—are known as food contact articles. Many of these are made from polymers, which can break down into smaller fragments when subjected to heat, wear, or repeated handling.
One study observed that common actions like tearing open packaging, cutting wrappers, or twisting caps can produce plastic fragments. Heating and time exacerbate this, meaning warmer foods and longer storage may increase the issue.
Packaging swaps that cut microplastic exposure
Plastic tea bags pose a significant concern. For instance, one plastic tea bag steeped at approximately 203 degrees Fahrenheit released around 11.6 billion microplastic and 3.1 billion nanoplastic particles in just one cup. Opting for loose leaf tea with a stainless steel infuser or paper bags without plastic sealing can mitigate this.
If you do use bagged tea, it’s wise to avoid squeezing the bag or stirring it vigorously, as agitation may intensify wear. Whenever possible, store drinks and sauces in glass or stainless steel containers, limiting the time food contacts plastic. After opening a bottled drink, pour it into a glass instead of repeatedly capping it, which can create friction.
Additionally, selecting packaging that reduces plastic contact, particularly on components that rub together, can help. Simpler closures with fewer plastic-on-plastic interactions tend to perform better in terms of abrasion control.
Smarter utensils and kitchen habits
Cutting boards merit attention since knives directly engage with their surfaces. Studies have traced polyethylene fragments found in retail meats back to plastic cutting boards. For most chopping, consider switching to wooden or glass boards. If you retain plastic boards for raw meat, replace them when noticeable grooves develop and avoid heavy scraping that can damage the surface.
Choose utensils that don’t scrape softer plastics. For stirring, wooden or silicone tools are preferable over metal ones in plastic containers. It’s also best to avoid reheating food in disposable plastic containers; transferring leftovers to glass or ceramic dishes before heating can prevent hot temperatures from affecting plastic components.
Food, health, and microplastics
There’s a growing body of research on the effects of these particles on health. One study examined surgical patients and found microplastics in tissues from plaque removed from neck arteries, linking their presence to a higher risk of heart attack, stroke, or death over roughly 34 months. While this doesn’t establish a direct cause-and-effect relationship, it certainly prompts questions about minimizing unnecessary exposure.
The findings also emphasize the need for improved testing methods and consistent reporting standards, allowing scientists and regulators to reliably compare results across studies.
There are policy suggestions on the table, advocating for regulatory bodies to mandate tests examining the migration of particles from packaging and tools under realistic usage conditions. Such research could scrutinize how time, temperature, and repeated use cycles affect particle presence. Streamlined testing may aid manufacturers in creating safer products and help consumers make informed choices.
Some straightforward changes can be made right now—select tea that avoids plastics, opt for glass or stainless steel containers for hot foods and long-term storage, and replace worn plastic items to maintain smooth surfaces.
This study appears in npj Science of Food.
