In March 2019 researchers from Japan published the results of their study to assess the effect of green tea consumption on risk of colorectal cancer. A total of 13,957 men and 16,374 women, aged over 35 years at the start of the study, were involved in the study. Information on green tea consumption was collected via a food frequency questionnaire. Over a follow-up period of 16 years, 429 men and 343 women were diagnosed with colorectal cancer. Results showed that there was no overall significant association between green tea consumption and risk of colorectal cancer. However, it was noted that a greater consumption of green tea was slightly associated with a decreased risk of male colon cancer.
Wada K et al. Green tea intake and colorectal cancer risk in Japan: the Takayama study. Jpn J Clin Oncol. 2019 Mar 11. [Epub ahead of print]