Plasma lipids and fasting glucose, heart rate and blood pressure, anthropometry, smoking and alcohol questionaries, nutrition, sleep quality, stress will be assessed. ECG records are obtained form all participants. Subclinical target organ damage (carotid and periferal atherosclerosis, pulse wave velocity) will be measured in selected sites. Brain natriuretic peptide, adipose tissue cytokines, hsCRP and genetic markers are also under evaluation