New research from McGill University in Canada has found that some premium plastic tea bags can release billions of microscopic plastic particles into a single cup of tea. The study, published in the journal Environmental Science and Technology, examined four different commercial teas packaged in plastic mesh bags, often used for pyramid-shaped tea bags.
The researchers removed the tea leaves and placed the empty bags in water heated to 95°C, mimicking the brewing process. They discovered that a single plastic tea bag released approximately 11.6 billion microplastic and 3.1 billion nanoplastic particles into the hot water. These particles are invisible to the naked eye.
Lead researcher Laura Hernandez expressed surprise at the levels found, noting they were several orders of magnitude higher than plastic loads previously reported in other foods, such as bottled water. She suggested the high temperatures might contribute to the release, as the plastic is exposed to boiling water.
The World Health Organization has stated that microplastics in drinking water do not appear to pose a risk based on current evidence, but called for further research. The McGill team also urged more investigation into the health effects of ingesting these particles.
Hernandez advised consumers to avoid plastic packaging altogether, recommending loose tea or tea in paper bags. She emphasized that the issue is not specific brands but the use of plastic, which becomes single-use waste and contributes to environmental pollution.
