It is suspected that the polyphenol content is chiefly responsible for the chemoprotective, antiproliferative, antimicrobial and antioxidant activity of green tea The caffeine content is predominantly responsible for central nervous system activity and an interaction between both appears necessary for increasing thermogenesis. ANTIOXIDANT
Green tea has consistently demonstrated strong antioxidant activity. In a recent controlled human trial, 24 healthy women consumed 2 cups of green tea (250 mg catechins/day) for 42 days (Erba et al 2005). The results showed a significant increase in plasma antioxidant status, reduced plasma peroxides and reduced LDL-cholesterol when compared with controls. Several other in vitro animal and human studies have also demonstrated that green tea inhibits lipid peroxidation and scavenges hydroxyl and superoxide radicals (Leenen et al 2000, MCS et al 2002, Rietveld & Wiseman 2003, Sung etal 2000).
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