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 ) .
Coffee consumption and risk of type 2 diabetes mellitus among middle-aged Finnish men and women.
CONTEXT Only a few studies of coffee consumption and  diabetes mellitus ( DM )  have been reported , even though coffee is the most consumed beverage in the world . OBJECTIVE To determine the relationship between coffee consumption and the incidence of  type 2 DM among Finnish individuals , who have the highest coffee consumption in the world . DESIGN , SETTING , AND PARTICIPANTS A prospect i ve study from combined surveys conducted in 1982 , 1987 , and 1992 of 6974 Finnish men and 7655 women aged 35 to 64 years without history of stroke , coronary heart disease , or DM at baseline , with 175 682 person-years of follow-up .  Coffee consumption and other study parameters were determined at baseline using st and ardized measurements . MAIN OUTCOME MEASURES Hazard ratios ( HRs ) for the incidence of type 2 DM were estimated for different levels of daily coffee consumption . RESULTS During a mean follow-up of 12 years , there were 381 incident cases of type 2 DM . After adjustment for confounding factors ( age , study year , body mass index , systolic blood pressure , education , occupational , commuting and leisure-time physical activity , alcohol and tea consumption , and smoking ) , the HRs of DM associated with the amount of coffee consumed daily ( 0 - 2 , 3 - 4 , 5 - 6 , 7 - 9 , > or = 10 cups ) were 1.00 , 0.71 ( 95 % confidence interval [ CI ] , 0.48 - 1.05 ) , 0.39 ( 95 % CI , 0.25 - 0.60 ) , 0.39 ( 95 % CI , 0.20 - 0.74 ) , and 0.21 ( 95 % CI , 0.06 - 0.69 ) ( P for trend<.001 ) in women , and 1.00 , 0.73 ( 95 % CI , 0.47 - 1.13 ) , 0.70 ( 95 % CI , 0.45 - 1.05 ) , 0.67 ( 95 % CI , 0.40 - 1.12 ) , and 0.45 ( 95 % CI , 0.25 - 0.81 ) ( P for trend = .12 ) in men , respectively . In both sexes combined , the multivariate-adjusted inverse association was significant ( P for trend < .001 ) and persisted when stratified by younger and older than 50 years ; smokers and never smokers ; healthy weight , overweight , and obese participants ; alcohol drinker and nondrinker ; and participants drinking filtered and nonfiltered coffee . CONCLUSION Coffee drinking has a grade d inverse association with the risk of type 2 DM ; however , the reasons for this risk reduction associated with coffee remain unclear
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 ) .