There is a direct impact that habitual physical activity has on various groups. For children and adolescents, numerous research studies have confirmed an alarming increase in the incidence of obesity in grade school and high school students, both male and female. A number of factors have been cited in this respect, including the rise in popularity of computer-based video games, and a decline in some countries in mandatory physical education courses in schools. There is no doubt that with the increase in obesity levels in these age groups, there has been a correspondingly dramatic rise in the incidence of juvenile diabetes, an irreversible condition that will likely result in life-long health problems. When children are required to engage in physical activity, either structured, as in competitive sport, or unstructured physical play, child obesity rates are demonstrably lower.