Predictors of Children's Body Mass Index: a Longitudinal Study of Diet and Growth in Children Aged 2-8 Y

Objective: To identify longitudinal variables related to children's body mass index (BMI) (kg/m(2)) at age 8 y.

Design: A longitudinal design, with nine interviews per child from ages 2 to 8 y.

Subjects: In all, 70 white children (37 males, 33 females) who were continuous participants since infancy in the longitudinal study. Families were primarily middle and upper socioeconomic status.

Measurements: At each interview, children's height and weight were measured, and mothers provided 3 days of the child's intake data (a 24-h recall and 2 days of food records).

Analyses: Analyses used were means+/-s.d., correlations, repeated measures analysis of variance, and forward stepwise regression. BMI at each interview was calculated and age of adiposity rebound was determined.

Results: Children's BMI at 8 y was negatively predicted by age of adiposity rebound and positively predicted by their BMI at 2 y. Additionally, each model included one longitudinal dietary variable; mean protein and fat intakes recorded between 2 and 8 y were positive predictors of BMI at 8 y; mean carbohydrate intake over the same time period was negatively related to BMI at 8 y. R(2) values indicated that these three-variable models predicted 41-43% of the variability in BMI among children. BMI of 23% of the children exceeded the 85th CDC percentile.

Conclusions: The results of this study show that factors in early life are associated with children's BMI at age 8 y.