To determine whether fructose is a contributor to metabolic co-morbidity in children, we will conduct a convenience cohort within-subject intervention with repeated measures, stratified by racial/ethnic group (Latinos vs. African Americans vs. Caucasians). The intervention will consist of restricting fructose ingestion only to naturally-occurring fructose in fruits and vegetables (approximately 15 gm/day for 10 days), by substituting complex carbohydrate for excess dietary fructose, while maintaining neutral energy balance. We anticipate fructose restriction to differentially improve co-morbidities in different racial/ethnic groups.