Tea Study Reveals Concerning Contaminant Levels
Researchers from Recep Tayyip Erdoğan University in Turkey examined 28 tea brands and discovered that plastic tea bags leach microplastics and bisphenol A (BPA) into brewed tea. Their analysis found that a single cup prepared with a plastic tea bag contains between 555 and 2,498 microplastic particles. Additionally, BPA concentrations in one cup surpassed 20% of the daily safe intake limit established by the European Food Safety Authority (EFSA).
Tea Varieties and Microplastic Content
The study assessed 28 tea samples categorized as follows:
- 4 brands using plastic tea bags,
- 10 brands with cellulose-based bags,
- 14 loose-leaf teas.
Tea bags were steeped in water heated to approximately 95 °C. Results showed that loose-leaf teas contained substantially fewer microplastic particles. Specifically, one kilogram of loose tea had between 146 and 1,178 microplastic fragments, mainly introduced from environmental pollution and manufacturing equipment. To ingest as much microplastic from loose tea as from a single plastic tea bag, one would need to consume over 450 grams of loose tea.
The analysis only counted particles larger than 100 micrometers. The authors emphasized the health implications, stating:
“Our findings indicate that BPA intake could reach up to 21.7% of EFSA’s tolerable daily intake (TDI), which serves as a critical warning—especially for sensitive groups such as pregnant women and children.”
This study was published in the journal npj Science of Food.
Given that millions worldwide consume tea daily, these findings highlight the urgent need for stringent quality control in food products. The detected levels of microplastics and BPA raise health concerns, particularly for vulnerable populations, underscoring the importance of adopting eco-friendly packaging and safer production methods. This research lays the groundwork for further investigations and potential updates to food safety regulations internationally.