The consumption of green tea did not decrease the levels of fasting plasma glucose , fasting serum insulin , OGTT-2 h glucose , haemoglobin A₁c and HOMA(IR ) in population s at risk of T2DM .
BACKGROUND Although the regular consumption of green tea or green tea extract has been considered to improve insulin sensitivity , the reported results are inconsistent .
Therefore , we conducted a meta- analysis to evaluate the effect of green tea or green tea extract on insulin sensitivity and glycaemic control in population s at risk of type 2 diabetes mellitus ( T2DM ) .
A green tea extract high in catechins reduces body fat and cardiovascular risks in humans.
OBJECTIVE The body fat reducing effect and reduction of risks for cardiovascular disease by a green tea extract ( GTE ) high in catechins was investigated in humans with typical lifestyles . RESEARCH METHODS AND PROCEDURES Japanese women and men with visceral fat-type obesity were recruited for the trial . After a 2-week diet run-in period , a 12-week double-blind parallel multicenter trial was performed , in which the subjects ingested green tea containing 583 mg of catechins ( catechin group ) or 96 mg of catechins ( control group ) per day . R and omization was stratified by gender and body mass index at each medical institution . The subjects were instructed to maintain their usual dietary intake and normal physical activity . RESULTS Data were analyzed using per- protocol sample s of 240 subjects ( catechin  group ; n = 123 , control group ; n = 117 ) . Decreases in body weight , body mass index , body fat ratio , body fat mass , waist circumference , hip circumference , visceral fat area , and subcutaneous fat area were found to be greater in the catechin group than in the control group . A greater decrease in systolic blood pressure ( SBP ) was found in the catechin group compared with the control group for subjects whose initial SBP was 130 mm Hg or higher . Low-density lipoprotein ( LDL ) cholesterol was also decreased to a greater extent in the catechin group . No adverse effect was found . DISCUSSION The continuous ingestion of a GTE high in catechins led to a reduction in body fat , SBP , and LDL cholesterol , suggesting that the ingestion of such an extract contributes to a decrease in obesity and cardiovascular disease risks
The consumption of green tea did not decrease the levels of fasting plasma glucose , fasting serum insulin , OGTT-2 h glucose , haemoglobin A₁c and HOMA(IR ) in population s at risk of T2DM .
BACKGROUND Although the regular consumption of green tea or green tea extract has been considered to improve insulin sensitivity , the reported results are inconsistent .
Therefore , we conducted a meta- analysis to evaluate the effect of green tea or green tea extract on insulin sensitivity and glycaemic control in population s at risk of type 2 diabetes mellitus ( T2DM ) .