Obesity in young people is a form of malnutrition that is found more and more in industrialized countries known both for its association with obesity in adult age and the chronic-degenerate pathologies correlated to it. In 1998 in the United States the prevalence of obesity in 4-12 year olds was 22% for the Hispanics and Afro-Americans and 12.3% for the non Hispanic Caucasians Also in children as in adults, the consequence of obesity is hyperinsulinemia, in direct proportion to the body weight. In this review we discuss the effects of hyperinsulinemia and obesity in young people, and evaluated the difference of cardiovascular complication in young and in adults.