Influence of Coffee on the Health and on the Heart of Normal, Diabetics e Coronary Artery Disease Patients

Inclusion Criteria: Normal Volunteers: 1. Healthy volunteer. 2. Age between 20 and 80 years. 3. No addict to drugs. 4. Absence of chronicle diseases. 5. No alcohol abuse. 6. No smoker. Coronary artery disease: 1. Presence of coronary artery disease, by coronary angiography 2. Stable angina, class 1-3 of CCS. 3. Age between 20 and 80 years. 4. Treadmill effort test with ischemia. 5. No alcohol abuse. 6. No smoker. Diabetes: 1. Presence of type II Diabetes on oral treatment. 2. Age between 20 and 80 years. 3. Absence of chronicle diseases, except diabetes. 4. No alcohol abuse. 5. No smoker. Exclusion Criteria: Normal Volunteers: 1. Any blood test with twice or more the upper limit range. 2. Presence of enlarged QRS. Coronary artery disease: 1. Any blood test with twice or more the upper limit range even with treatment. 2. Presence of enlarged QRS. 3. Ventricular dysfunction (EF \< 45%). Diabetes: 1. Blood glucose greater than 160 mg/dL. 2. Others blood tests with twice or more the upper limit range even with treatment. 3. Presence of enlarged QRS.