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Anti-obesity effects of green tea extracts on humans


K. A. Naser ,

Sherwood Forest NHS Foundation Trust, Mansfield, GB
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D. Niyangoda,

University of Peradeniya, LK
About D.
Department of Pharmacy, Faculty of Allied Health Sciences
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R. Wijesinghe

University of Peradeniya, LK
About R.
Postgraduate Institute of Science
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Introduction: Green tea is heavily promoted and sold over the counter for many illnesses, including obesity.
Methodology: Literature was reviewed focusing on the key words; tea, green tea, catechin, overweight, obesity, side effects, adverse effects, transient ischemic attack, stroke and liver function, up to December 2014.
Results and discussion: Majority of the studies on this topic were short term and involved only a small number of participants. Though these studies demonstrated very small reduction of weight, evidence was inadequate for the use of green tea as an anti-obesity agent. In this review, the effect of green tea on obesity and some possible harmful effects of green tea are discussed. Current evidence on green tea does not support the use of it as an anti-obesity agent. There are several reports of side effects. The liver side effects are a cause for concern.
Conclusions: Long term use of green tea as over the counter supplement should not be encouraged. Rather it should be considered a drink, very much like any other tea or coffee, till further evidence of efficacy and safety are proven.

Sri Lanka Journal of Diabetes, Endocrinology and Metabolism 2015; 5: 42-50

How to Cite: Naser, K.A., Niyangoda, D. and Wijesinghe, R., 2015. Anti-obesity effects of green tea extracts on humans. Sri Lanka Journal of Diabetes Endocrinology and Metabolism, 5(1), pp.42–50. DOI:
Published on 10 Jul 2015.
Peer Reviewed


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