Does green tea (Camellia sinensis) prevent cancer?

From: The Cochrane Colaboration

Journal rating:
rating: 98%
Study Quality:
rating: 100%
%

Overall Reliability

Article Quality:
rating: 75%
Partcipants
rating: 100%

Participants/situation

  • 51 studies with over 1,600,000 participants

Study

  • The paper is a systematic review / meta analysis of all relevant trials.
  • The data from all similar trials have been grouped to form an overall outcome.

Results

  • No evidence that green tea could reduce the incidence of gastric cancer.
  • Limited evidence that green tea could reduce the incidence of; liver cancer.
  • Conflicting evidence that green tea could reduce the incidence of; esophageal, colon, rectum, urinary bladder cancer, and pancreatic cancer.
  • Some evidence that green tea could reduce the incidence of; prostate cancer,
  • Moderate to strong evidence that green tea could reduce the incidence of lung and colorectal cancer.

Answer

  • Yes (without confidence); for prostate, lung, and colorectal cancer.

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Editors Notes

  • Desirable green tea intake is 3 to 5 cups per day (up to 1200 ml/day), providing a minimum of 250 mg/day catechins.
  • Drinking green tea appears to be safe at moderate, regular and habitual use.

 

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