GPT and Insulin resistance: Additionally, the higher insulin resistance group demonstrated significantly elevated levels of SBP, DBP, BMI, ALT, AST, LDL, fasting C-peptide, 1-hour postprandial C-peptide, 2-hour postprandial C-peptide, 1h-PG,2h-PG and HbA1c, along with lower Scr levels.