Childhood Self-Control and Adolescent Obesity: Evidence from Longitudinal Data on a National Cohort

BACKGROUND: Whether self-control at school entry and changes in self-control in the early school years are predictive of BMI change and obesity onset over the next 8 years using longitudinal data on a nationally representative sample of US children. METHODS: Data from the Early Childhood Longitudinal Study-Kindergarten Class 1998 were analyzed. The analysis sample included 7060 children with data from kindergarten (mean age = 6 years) until eighth grade (mean age = 14 years). Self-control was assessed using teacher-reported scales. Child BMI and obese status (BMI ≥95th percentile for age and gender) were computed from height and weight measurements. Weighted linear and logistic regression models were estimated, adjusting for child's cognitive ability and a rich set of child and family covariates. RESULTS: (95% CI: -2.82 to -0.02) lesser increase in BMI and 66% lower odds of new obesity onset (AOR = 0.34; 95% CI: 0.14-0.83), between kindergarten and eighth grade. CONCLUSIONS: Low self-control at school entry is an important risk factor for unhealthy BMI increase during the transition to adolescence. Increase in self-control in the early school years may prevent unhealthy BMI increase and obesity in adolescence.