Determinants of a dietary pattern linked with greater metabolic risk and its tracking during adolescence

BackgroundAlthough growing evidence suggests that dietary patterns associated with noncommunicable diseases in adulthood may develop early in life, when these are established, as well as their determinants, remains unclear. MethodsWe examined determinants and tracking of a dietary pattern (DP) associated with metabolic risk and its key food groups among 860 adolescents in the Western Australian Pregnancy (Raine) Cohort study. Food intake was reported using a food frequency questionnaire (FFQ) at 14 and 17years. Z-scores for an energy-dense, high-fat, low-fibre' DP were estimated by applying reduced rank regression at both ages. Tracking was based on the predictive value (PV) of remaining in the DPZ-score or food intake quartile at 14 and 17years. Early-life exposures included: maternal age; maternal pre-pregnancy body mass index; parent smoking status during pregnancy; and parent socio-economic position (SEP) at 14 and 17years. Associations between the DPZ-scores, early-life factors and SEP were analysed using regression analysis. ResultsDietary tracking was strongest among boys with high DPZ-scores, high intakes of processed meat, low-fibre bread, crisps and savoury snacks (PV>1) and the lowest intakes of vegetables, fruit and legumes. Lower maternal education (=0.09, P=0.002 at 14years; =0.14, P<0.001 at 17years) and lower maternal age at birth (=0.09, P=0.003 at 14years; =0.11, P=0.004 at 17years) were positively associated with higher DPZ-scores. ConclusionsAn energy-dense, high-fat, low-fibre dietary pattern tracks more strongly among adolescent boys who have high scores for this pattern at 14years of age. These findings highlight target foods and population subgroups for early interventions aiming to improve dietary behaviours.