A new study published in the journal Chemosphere raises concerns about plastic particles released from teabags during brewing. Researchers found that a single teabag can release millions of micro- and nanoplastic particles—pieces of plastic smaller than 5 millimeters and 1 micrometer, respectively—into your cup of tea.
Scientists from the Universitat Autònoma de Barcelona examined three types of commercially available teabags made from nylon, polypropylene, and cellulose. By simulating normal tea brewing conditions at 95°C (203°F), they discovered that all three types released plastic particles into the water in varying amounts.
The polypropylene teabags released the highest number of particles – approximately 1.2 billion per milliliter – while nylon teabags released about 8.2 million particles per milliliter. Even cellulose teabags, often considered more environmentally friendly, released around 135 million particles per milliliter.
To understand potential health implications, the researchers exposed human intestinal cells to these particles. They found that different types of cells responded differently to the plastic particles, with some cells showing higher uptake rates than others. Of particular interest was the discovery that cells producing more mucus tended to interact more with the plastic particles, suggesting that our digestive system’s protective barriers might increase exposure to these materials.
“While we’ve known about microplastics in tea bags, this study reveals concerning details about just how many particles are released and how they might interact with our digestive system,” says Dr. Alba García-Rodríguez, one of the study’s lead authors. “This underscores the urgent need to better understand the potential health impacts of chronic exposure to these particles.”
The research team emphasizes that their findings highlight the need for more studies on the long-term health effects of consuming beverages prepared with plastic-based teabags. They also suggest that manufacturers consider alternative teabag production materials to minimize plastic particle release.
For consumers concerned about plastic exposure, the researchers recommend looking for teabags made from natural materials like cotton or paper, or using loose leaf tea with reusable strainers.
This study is part of growing research into the prevalence of micro- and nanoplastics in our food and beverages and their potential impact on human health. While the full health implications remain unclear, the findings suggest that even simple daily activities like brewing tea might contribute to our exposure to plastic particles.
