The FCS is a longitudinal source of data on diet, activity and family and environmental factors in children. By 1996, the investigators had collected extensive dietary data with an average of 32 days of diet records and almost 50 days of electronically monitored physical activity data for each subject. Additional data included psychosocial and anthropometric data on children and their parents. The extension of the FCS allows continued monitoring of eating behaviors and physical activity habits of the children and their parents, as well as the personal environmental and behavioral factors influencing changes in the child's physical activity, diet, blood pressure, lipids and obesity from pre-school into the late teen years.