In a study of 74,000 Chinese women, drinking 2 cups of green tea daily decreased the risk of developing gastrointestinal cancer by 21%. This applied to cancers of the colon, rectum, stomach, and esophagus. Green tea did not decrease the risk of liver or pancreatic cancer. Naturopathic doctor Dr. Kaycie Grigel provides a helpful commentary on the article in the Natural Medicine Journal.