The development of overweight and bone density among adolescent girls: A 3-year prospective cohort study

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Being overweight as an adolescent is associated with many health problems, both during adolescence and throughout the rest of the life span. The proportion of Australian adults who are overweight is increasing rapidly and it appears that overweight is also increasing among Australian adolescents. Unfortunately, little is known about the relative influences of physical activity, sedentary activity and dietary fat intake on the development of overweight among adolescents. Understanding this issue will inform our efforts to prevent the development of overweight and to maintain healthy weight among Australian adolescents. Bone fractures among older adults have a major impact on their overall health, quality of life and capacity for independent and satisfying living. Peak bone strength is reached during adolescence and, although bone strength can be largely maintained though adult life with appropriate diet and physical activity, little can be done to further strengthen bones during adulthood. The goal of public health is to foster the development of maximum bone strength among adolescents in order to reduce the severity of osteoporosis among the older adults of the future. Our understanding of the factors which influence the development of maximum bone strength is inadequate to the task of designing programs and interventions intended maximise bone strength among the current generation of adolescents. This proposed study is intended to make a significant contribution to our understanding of the development of overweight and bone strength among adolescents. As our understanding of these health issues improves we will be able to make more effective contributions to the health of the Australian population, both during adolescence and across the lifespan.