Scientific Approach to Green Tea Preparation

A few months ago I seem to have become a green tea advocat, since I have realized that it is probably the most healthy beverage ever invented (including water).

The enormous study “Green Tea Consumption and Mortality Due to Cardiovascular Disease, Cancer, and All Causes in Japan” took 11 years with over 40.000 participants, and got the following result:

Green Tea Benefits in Woman

  • 23% lower risk of dying from any cause
  • 31% lower risk of dying from CVD
  • 62% lower risk of dying from stroke

Green Tea Benefits in Men

  • 12% lower risk of dying from any cause
  • 22% lower risk of dying from CVD
  • 42% lower risk of dying from stroke

On my quest for the perfect cup of tea, I have looked for scientific analysis and have found the enlightening paper “Factors Affecting the Caffeine and Polyphenol Contents of Black and Green Tea Infusions“. Here are the most important findings of it:

How to get the most out of a tea bag. The more extracted solids / catechins, the better.

Brewing

  • doubling the bags doubles the extracted solids (which is good!)
  • Increasing brewing time from 1 minute to 2 minutes doubles the catechins. 5 minutes tripple the catechins.

Teabags vs. loose leafes

  • Loose leafes are better than teabags.
  • When teabags are left floating, the flow resistance of the material blocks almost everything! this is very bad.
  • Continuously dunk a tea bag and the extraction is 4 times better!
  • Loose leafes are still about 20% better than dunked teabags, and after about 2 minutes the water is saturated (no need to wait any further)

Leafe size / packing

  • loose leafes? extraction is faster with smaller leafes. No need for dunking.
  • teabag with small leafes / tightly packed? Continuously dunk it
  • teabag with large leafes / loosely packed? Leafe it static (the flows are driven by convection)

CONCLUSION

  • loose leafes are the best. Brew for 2 minutes and you have everything they got.
  • If you have to use teabags, dunking the bag gets you 4 times the catechins!

5 Comments on "Scientific Approach to Green Tea Preparation"

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[…] Martin Ankerl Scientific Approach to Green Tea Prepreation Posted by root 3 hours ago (http://martin.ankerl.com) May 13 2009 green tea benefits in woman 23 lower risk of dying from any cause 31 lower risk of dying from cvd 62 lower risk of dying from stroke Discuss  |  Bury |  News | Martin Ankerl Scientific Approach to Green Tea Prepreation […]

El Pocco
Guest

Do you mean 120 minutes or seconds in the conclusion?

Martin Ankerl
Guest

Hi El Pocco, you are right its 120 seconds not 120 minutes 🙂

smaximus
Guest

awesome article! to the point and its all covered.
now i just need some only the facts info on cultivating Camellia sinensis.

thanks!

Amelie Rencontres
Guest

I drink green tea all my life, I knew that it’s healthy but never heard about this benefits 🙂 Thank you a lot 🙂

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