Subjects of blood glucose levels "Impaired fasting glucose; IFG": fasting blood glucose ≧ 100 mg / dL, < 126 mg/dL or "Impaired glucose tolerance; IGT": 2 hours postprandial blood glucose ≧ 140mg/dL, < 200 mg/dL or clinically judged to be mild or moderate diabetes mellitus (HbA1c < 9%) .