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Related Experiment Video

Updated: Jun 3, 2026

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
07:46

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Tea consumption enhances endothelial-dependent vasodilation; a meta-analysis.

Rouyanne T Ras1, Peter L Zock, Richard Draijer

  • 1Nutrition and Health Department, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands. Rouyanne.Ras@unilever.com

Plos One
|March 12, 2011
PubMed
Summary

Regular tea consumption significantly improves endothelial function, enhancing blood vessel dilation. This finding offers a potential explanation for the reduced risk of cardiovascular disease and stroke associated with drinking tea.

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Area of Science:

  • Cardiovascular Health
  • Endothelial Function
  • Nutritional Science

Background:

  • Tea consumption is linked to reduced cardiovascular disease and stroke risk.
  • Tea's vascular effects, particularly on the endothelium, may explain this association.

Purpose of the Study:

  • To conduct a meta-analysis of controlled human intervention studies.
  • To evaluate the effect of tea consumption on flow-mediated dilation (FMD) of the brachial artery.
  • To assess FMD as a measure of endothelial function and its association with cardiovascular risk.

Main Methods:

  • Systematic literature search of multiple databases (Medline, Embase, etc.) through March 2009.
  • Inclusion criteria: tea as sole variable, placebo-controlled, complete FMD data.
  • Random effects model used to pool FMD data; heterogeneity analyzed.

Main Results:

  • Nine studies with 15 arms analyzed.
  • Tea intake increased FMD by 2.6% (95% CI: 1.8-3.3%, P<0.001) versus placebo.
  • This represents a ~40% relative increase in FMD, with heterogeneity noted.

Conclusions:

  • Moderate tea consumption significantly enhances endothelial-dependent vasodilation.
  • This improvement in endothelial function may explain reduced cardiovascular events in tea drinkers.