A single tea bag can leak billions of pieces of microplastic into your brew

Researchers at McGill University in Canada analyzed the effects of placing four different commercial tea bags into boiling water. They found that a single bag releases around 11.6 billion microplastic particles, and 3.1 billion even smaller nanoplastic particles, into the cup — thousands of times higher than the amount of plastic previously found in other food and drink. The health effects of drinking these particles are unknown, according to the researchers, who called for further study into the area.

The team removed the tea from inside the bags to prevent it from interfering with the results, before boiling the bags in water to simulate the tea-making process. Scientists have found microplastics in various foods, but less research has been done into whether they can be shed into water during the brewing of tea and other hot drinks. Many tea producers use polypropylene to seal their bags. Humans eat an average of 5 grams of plastic a week, according to a separate study earlier this year — the equivalent of a credit card’s weight in plastic.

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