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BACKGROUND: This study aimed to systematically review efficacy of green tea extract (GTE) on weight control in metabolic syndrome (MS).METHODS: Related randomized controlled trials (RCTs) about GTE and MS were searched and identified from PubMed, Scopus, PsycINFO, EMBase, the VIP database, CNKI, and Wanfang Resource Database.Valid data were extracted according to strict inclusion and exclusion criteria.The RevMan 5.2.2 software was used to carry out the meta-analysis.