GPT and diabetes mellitus: HbA1c (%): glycated hemoglobin; FPG (mg/dl): fasting plasmatic glycemia; GOT (UI/l): glutamic oxaloacetic transaminase; GPT (UI/l): glutamic pyruvic transaminase; TC (mg/dl): total cholesterol; HDL-c (mg/dl): high-density lipoprotein cholesterol; LDL-c (mg/dl): low-density lipoprotein cholesterol; TGL (mg/dl): triglycerides; DDS: diabetes distress scale