Effects of green tea extract on overweight and obese women with high levels of low density-lipoprotein-cholesterol (LDL-C): a randomised, double-blind, and cross-over placebo-controlled clinical trial.
BACKGROUND
This study aims to examine the effects of green tea extract (GTE) supplement on overweight and obese women with high levels of low density lipoprotein-cholesterol (LDL-C).


METHODS
The randomized, double-blind, crossover and placebo-controlled clinical trial was conducted from August 2012 to December 2013. Seventy-three out of 90 subjects aged between 18 and 65 years, with body mass index (BMI) ≥ 27 kg/m2 and LDL-C ≥ 130 mg/dl were included in the analysis. The subjects were randomly divided into Groups A and B. Group A received GTE supplement treatment for the first 6 weeks, while Group B received placebo daily. After 6 weeks of treatment and 14 days of washout period, Group A switched to placebo and Group B switched to GTE treatment for 6 weeks. The reduction of LDL-C level between treatments was assessed as the outcome. Additionally, anthropometric measurements, plasma lipoproteins and hormone peptides of both groups were measure at the beginning of weeks 6, 8, and 14 after treatment.


RESULTS
Subjects treated with GTE (n = 73) for 6 weeks showed significant differences, with 4.8% (p = 0.048) reduction in LDL-C and 25.7% (p = 0.046) increase in leptin. However, there was no statistical difference in the levels of total cholesterol, triglyceride and high density lipoprotein between the GTE and placebo groups after treatments.


CONCLUSIONS
This study shows that green tea extract effectively increases leptin and reduces LDL in overweight and obese women after 6 weeks of treatment even though there were no significant changes in other biochemical markers related to overweight.


TRIAL REGISTRATION
This clinical trial is registered with ClinicalTrials.gov: NCT02116517 on 17 April 2014. Retrospectively registered. The first patient enrolled in October 2012 and the study was completed December 2013.
['Huang|Lin-Huang|LH|http://orcid.org/0000-0003-3928-1519', 'Liu|Chia-Yu|CY|', 'Wang|Li-Yu|LY|', 'Huang|Chien-Jung|CJ|', 'Hsu|Chung-Hua|CH|']
D000886:Anthropometry D028241:Camellia sinensis D002392:Catechin D008078:Cholesterol, LDL D018592:Cross-Over Studies D004311:Double-Blind Method D005260:Female D006801:Humans D009765:Obesity D050177:Overweight D010919:Placebos D010936:Plant Extracts
Green tea extract Obesity LDL-C Leptin EGCG Epigallocatechin gallant Hyperlipidemia Low density lipoprotein