Korean J Fam Pract. 2018; 8(6): 848-854  https://doi.org/10.21215/kjfp.2018.8.6.848
The Efficacy and Safety of Black Tea Extract on Weight or Body Fat Reduction in Overweight or
Obese Subjects: A Randomized, Double-Blind, Placebo-Controlled Study
Soo Jin Kim1, Kyung Soo Kim1,*, Myeong Soo Lee2, Eung Nam An3, Ji-Youn Kim4, Tae Ho Lee5, Namjoon Baek5, Sangjin Lee5,6
1Department of Family Medicine, College of Medicine, The Catholic University of Korea, Seoul; 2Korean Medicine Life Science, University of Science &
Technology, Daejeon; 3College of Sport Science, Sungkyunkwan University, Suwon; 4Exercise Rehabilitation Convergence Institute, Gachon University, Incheon;
5Dong-A Pharm Research Institute, Pharmaceutical Product Research Laboratories, Yongin; 6School of Pharmacy, Sungkyunkwan University, Suwon, Korea
Kyung Soo Kim
Tel: +82-2-2258-2895, Fax: +82-2-2258-2896
E-mail: kskim@catholic.ac.kr
ORCID: http://orcid.org/0000-0003-3501-1212
Received: August 25, 2017; Revised: September 19, 2017; Accepted: October 7, 2017; Published online: December 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

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Background: Black tea extracts (BTE), which are rich in gallic acid, have been associated with the improvement of obesity in rats. However, whether black tea consumption is beneficial in human subjects is unknown. In this study, we aimed to evaluate whether BTE can reduce body fat mass in human subjects.
Methods: We investigated the effects of BTE intake in 50 pre-obese and obese Korean adults (23 kg/m2 Results: After 8 weeks of BTE consumption the mean BMI decreased by 0.05±0.32 kg/m2 in the BTE group compared with a decrease of 0.18±0.78 kg/m2 in the placebo group. There was a 0.10±0.79 kg difference in weight within the BTE group. Abdominal computed tomography scans revealed a liver Hounsfield unit decrease of 0.32±5.84 in the BTE group compared with a decrease of 3.03±3.65 in the placebo group. None of the differences were statistically significant (P>0.05).
Conclusion: BTE was not effective in reducing human body weight or body fat composition, when compared with the effects of placebo.
Keywords: Black Tea Extract; Obesity; Body Mass Index; Visceral Fat

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