Inclusion Criteria:  Control group: normal BMI, body fat percentage < 25% for men and 35% for women  Normal-weight obesity group: normal BMI, body fat percentage > 25% for men and 35% for women  Metabolic syndrome group: BMI > 30 and 2 or more of the following: blood pressure >130/85 mmHg, fasting glucose >100 mg/dL, fasting triglycerides >150 mg/dL, HDL cholesterol < 40 mg/dL (men) or < 50 mg/dL (women).  Exclusion Criteria:  Presence of pacemaker Pregnant use of tobacco products using lipid lowering drugs