After resveratrol administration , there were significant differences in total weight ( 94.413.2 vs. 90.512.3 kg , P = 0.007 ) , body mass index ( BMI ) ( 35.63.2 vs. 34.33.0 kg/m ( 2 ) , P = 0.006 ) , fat mass ( 41.27.9 vs. 38.86.0 kg , P = 0.001 ) , and waist circumference ( WC ) ( 1099 vs. 10510cm , P = 0.004 ) .