Tea Rinsing Effectively Mitigates Probabilistic Health Risks From Heavy Metal Exposure
Shuangfei Hu1,2, Linlin Jin1,3, Lili Huang4
1School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, P.R. China.
Biological Trace Element Research
|July 30, 2026
Summary
Discarding the first tea infusion, known as tea rinsing, significantly reduces toxic heavy metal intake. This simple practice lowers carcinogenic risk, making tea consumption safer.
Area of Science:
- Environmental Chemistry
- Toxicology
- Food Science
Background:
- Tea is a major dietary source of heavy metal exposure.
- Tea rinsing is a common practice, but its effectiveness in reducing metal intake is unproven.
Purpose of the Study:
- To quantify heavy metal concentrations in tea infusions before and after rinsing.
- To evaluate the health risk mitigation effects of tea rinsing.
Main Methods:
- Measured concentrations of ten elements (Pb, As, Cr, Co, Cd, Mn, Cu, Fe, Al, Zn) in tea infusions.
- Assessed health risks using probabilistic methods, considering exposure duration and frequency.
Main Results:
- Significant reductions (P < 0.05) in Cr, Mn, Cu, Fe, and Zn concentrations after rinsing.
- Tea rinsing reduced mean adult carcinogenic risk by 36.2%, with As being the primary risk contributor.
- All assessed risk values remained within acceptable regulatory limits.
Conclusions:
- Tea rinsing is an effective method for reducing toxic element intake from tea.
- This practice can statistically lower potential health risks associated with heavy metal exposure.
- Exposure duration and frequency are key factors influencing probabilistic health risks.
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