Metabolic syndrome is commonly defined as the association of multiple risk factors for the development of atherosclerotic disease. Despite the different definitions of diagnostic criteria, the presence of at least three of the following conditions defines the clinical presentation of the metabolic syndrome: atherogenic dyslipidemia (low levels of HDL cholesterol, high levels of triglycerides, apolipoprotein B and small and dense LDL), basically high levels of systolic and diastolic blood pressure, impaired fasting glycemia and abdominal obesity [1]. Primary pathogenic mechanisms underlying metabolic syndrome are mainly due to insulin resistance (or poor insulin sensitivity) and visceral obesity. Insulin resistance, a condition where insulin determines a lower biological effect than expected, is largely represented in patients with metabolic syndrome and it is associated with a high risk of developing type 2 diabetes in the short term. Obesity and physical inactivity represent predisposing conditions for the development of metabolic syndrome and perhaps represent the main mechanism underlying the epidemic of metabolic syndrome, as observed in recent years.