Objectives　The objective of this study was to evaluate the effect of long-term consumption of tea containing quercetin glucosides on body fat accumulation and the safety in obese subjects.
Methods　We performed a randomized double-blind, placebo-controlled trial on subjects（111 men and 89 women）aged 20-64 years old with 25≦body mass index（BMI）＜30 kg/m². They were randomly assigned into two groups and consumed the beverages containing 0 mg or 110 mg of quercetin glucosides daily for 12 weeks.
Results　Both abdominal total fat area and visceral fat area were significantly reduced in test group compared with placebo group. No adverse effect related to the test beverage containing quercetin glucosides was observed in this study.
Conclusions　The results of this study suggested that the long-term consumption of tea containing quercetin glucosides reduced body fat in safe, and could be useful for prevention and amelioration of obesity and metabolic syndrome.