To provide an overview of the efficacy of green tea for the management of some diseases and conditions. A literature review was performed using the electronic database PubMed for studies published between January 2000 and March 2020. Mainly we retrieved articles scored as evidence level 1or 2according to Minds Manual for Guideline Development 2007, however, they did not follow Minds Manual for Guideline Developed 2017 and did not fill evidence level. ・AcknowledgmentThis review does not provide recommendations for the efficacy of green tea in the clinical setting but provides a summary of evidence.・Author Disclosure StatementWe, members of the Department of Eat-loss Medicine, Graduate School of Medicine, The University of Tokyo, were supported by the research funding provided by ITO EN, LTD.