Day 28 change from baseline ( mean ( SD ) ) : fasting glucose ( mmoll ( -1 ) ) = -1.17 ( 2.42 ) , -1.11 ( 3.45 ) , -0.52 ( 2.60 ) , -0.97 ( 2.83 ) and -0.15 ( 2.38 ) for placebo , 0.25 g , 0.5 g , 1.0 g and 2.0 g , respectively .