 The study is a cross-sectional evaluation of cardiac and vascular structure and function in a population of adolescents with type 2 diabetes compared to a group with similar age, sex, race and BMI with obesity alone and a non obese group with similar age, sex and race. 300 subjects with type 2 diabetes, 300 subjects with obesity and 300 non obese subjects will be studied. Assessment of CVD development will be accomplished using novel non invasive imaging methods for subclinical atherosclerosis including echocardiographic measurement of cardiac structure and function, ultrasound evaluation of carotid intimal medial thickness, and evaluation of endothelial function by brachial artery reactivity. The primary hypothesis is that adolescents with type 2 diabetes will have greater abnormality in cardiac and vascular structure and function compared to controls with obesity. Subjects with obesity alone will have greater abnormality in cardiac and vascular structure and function compared to controls who are not obese. Correlates of cardiac and vascular abnormalities including markers of inflammation, adiponectin, diet and physical activity will also be evaluated. 