After dietary intervention for half a year on the IFG population , BMI ( ( 24.87 3.69 ) kg/m ( 2 ) ) , FBG ( ( 6.27 0.24 ) mmol/L ) , FINS ( ( 7.14 1.05 ) mU/L ) , HOMA-IR ( 1.99 0.31 ) , leptin ( ( 13.07 2.22 ) g / L ) , LCN-2 ( ( 67.42 18.20 ) g/L ) of intervention group were decreased significantly compared to the levels of BMI ( ( 25.16 4.07 ) kg/m ( 2 ) ) , FBG ( ( 6.40 0.28 ) mmol/L ) , FINS ( ( 7.32 1.54 ) mU/L ) , HOMA-IR ( 2.08 0.45 ) , leptin ( ( 13.43 2.52 ) g/L ) , LCN-2 ( ( 74.87 17.81 ) g/L ) before dietary intervention , t values were 4.48 , 7.08 , 2.05 , 3.39 , 3.28 and 6.36 , respectively , and all P values were < 0.05 , while ADP ( ( 5.07 1.51 ) mg/L ) of intervention group after dietary intervention was increased significantly compared to the level of ADP ( ( 4.92 1.53 ) mg/L ) before dietary intervention , t = -2.47 and P < 0.05 .