 Non-diabetic patients with suspected or diagnosed CAD who are hospitalized for coronary angiogram will be enrolled in this study. The patients are expected to be similar to those who have visited our institute recently; approximately 28 of patients with CAD are diabetics, and one third of them are medically untreated at the time of their first visit. In recent years, 500-600 patients have undergone coronary angiography per year in this institute, and approximately 50 of them were without history of percutaneous coronary interventions PCI or coronary bypass surgery. Hence, approximately 180-210 patients per year will be candidates for the present project. 