Although the adult health indicators that we have found to be associated with child and adolescent television viewing are unlikely to result in clinical health problems by the age of 26 years, they are well established risk factors for cardiovascular morbidity and mortality later in life. Our results suggest that excessive television viewing in young people is likely to have far-reaching consequences for adult health. We concur with the American Academy of Pediatrics2 that parents should limit children’s viewing to 1–2 h per day; in fact, data suggest that less than 1 h a day would be even better. Although parents might find this difficult to maintain, lifestyle modifications in adulthood to reverse overweight, poor fitness, high blood cholesterol, and smoking are also notoriously difficult to achieve. Parents will need support and encouragement at an individual, community, and societal level. Adults are likely to obtain health benefits themselves if they lead by example and turn off the television. We believe that reducing television viewing should become a population health priority.