For many people, drinking tea is a comforting daily ritual. Whether it’s a morning wake-up cup or an evening moment of relaxation, tea is often seen as one of the healthiest beverages you can enjoy. But recent scientific research suggests that your tea might contain something unexpected, tiny plastic particles.
A Surprising Discovery
Scientists from the Autonomous University of Barcelona (UAB) recently discovered that certain commercial tea bags release large amounts of microplastics and nanoplastics when steeped in hot water. These particles are extremely small, far smaller than a human hair, and invisible to the naked eye.
The researchers tested tea bags made from different materials commonly used in packaging, including:
- Polypropylene
- Nylon-6
- Cellulose-based materials
When these tea bags were brewed, they released millions to billions of plastic particles into the water.
In fact, polypropylene tea bags released up to about 1.2 billion plastic particles per milliliter of tea, making them the biggest source of contamination among the tested materials.
Why Do Tea Bags Release Plastic?
Modern tea bags are not always made entirely from paper. Many contain plastic polymers that help maintain their shape and durability during brewing. When exposed to high temperatures, these materials can break down and release microscopic particles into the tea. This means that something as simple as pouring hot water over a tea bag can cause the material to shed microplastics.
What Happens to These Plastic Particles?
One of the most concerning findings from the study is that these plastic particles may interact with human cells. Researchers exposed the particles to human intestinal cells in laboratory experiments. They observed that the cells were able to absorb the microplastics, and in some cases the particles even entered the cell nucleus, the part that contains genetic material.
While scientists are still studying the long-term effects, this discovery raises important questions about how everyday plastic exposure may affect human health.
How to Reduce Plastic Exposure in Tea
If you’re concerned about microplastics in your tea, there are simple ways to reduce your exposure:
- Switch to loose-leaf tea instead of bagged tea.
- Use tea bags made from paper or natural fibers.
- Brew tea with stainless steel or glass tea infusers.
These small changes can significantly lower the chances of plastic particles ending up in your cup.
The Bottom Line
Tea is still a healthy beverage with many benefits, but this research highlights a hidden issue in modern food packaging. As plastic use continues to grow worldwide, scientists say it’s important to better understand how these materials affect both human health and the environment.
Sources
- Original research paper in Chemosphere: Teabag-derived micro/nanoplastics (true-to-life MNPLs) as a surrogate for real-life human exposure scenarios
- Autonomous University of Barcelona (UAB) press release summarizing the study findings
- PlasticHeal project summary with additional context on the study and its health relevance
