The majority of tea bags are still made from paper, but a study suggests plastic tea bags might be a harmful trend.

October 01, 2019

This story originally appeared on foodandwine.com by Mike Pomranz.

Reducing the use of plastics has been a popular environmental cause as of late—whether it’s giving the boot to plastic straws or eliminating plastic toys from fast food kids meals. But while eliminating the plastics we can see is an easy idea to rally behind, eliminating the ones we can’t see is trickier. Microplastics—the miniscule plastics that sneak into our food chain—can be tough to control because, unlike a Burger King toy, it’s not always clear where they come from. Here’s a fresh example: Canadian researchers recently discovered that a single plastic tea bag can release billions of tiny particles of plastic into your cuppa.

Related: Simple Ways to Cut Back on Plastic in Your Food & at Home

SOUTH CHINA MORNING POST / CONTRIBUTOR/GETTY IMAGES

Though the vast majority of tea bags are still made from paper, as the American Chemical Society (ACS)—who published the research—points out, some tea brands have been moving towards plastic tea bags. What scientists at McGill University in Montreal found is that “steeping a single plastic teabag at brewing temperature (95 °C) releases approximately 11.6 billion microplastics and 3.1 billion nanoplastics into a single cup of the beverage.” The study assured that these plastics were coming specifically from the bags by removing the tea beforehand and then matching the particles to the tea bags “using Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS)” afterward. All four tea bags tested were purchased commercially—meaning they are brands that can be found in grocery stores.

Making matters worse, the study found that the levels of plastics coming from the bags were thousands of times higher than found in other foods. Then, the big question becomes whether or not consuming these plastics is harmful to humans. Though the answer remains unknown, these researchers did test this plastic tea bag water on water fleas. The tiny crustaceans survived, but “they did show some anatomical and behavioral abnormalities,” according to the ACS.

As a response to the study, Peter F. Goggi, president of industry trade group Tea Association of the U.S.A., Inc., released a statement which read in part, "Materials used to create teabags, including nylon and PET, have been assessed by the FDA and other respected, independent agencies around the world for their safe use under various conditions of hot food and beverage contact applications. As explained in the study, the health effects of consuming micro- and nano-plastics to humans are not known. It should be noted that this research was not conducted on teabags made of PLA (polylactic acid, a biodegradable and compostable material) which is derived from cornstarch." Goggi went on to state that even the air in a room can contain microplastics which can affect test results, and that, by way of comparison, the concentration of microplastics mentioned in the study would constitute a fraction of a grain of sugar.

Meanwhile, this focus on microplastics overlooks a (literally) larger point: Opting for plastic tea bags to begin with contributes to more plastic waste even before these bags add more microplastics into the water the supply—not to mention that single-use tea bags are themselves a bit wasteful when you can buy tea in bulk. As a result, the takeaway from this study would seem to be pretty obvious: If you are trying to cut down on the impact of plastic on the environment, ditching plastic tea bags seems like an easy choice.

Update Oct. 1. 2019: This piece has been edited to include a comment from the Tea Association of the U.S.A., Inc.

This article originally appeared on foodandwine.com

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