BACKGROUND: Diet quality has been found to be related to cognitive health in school-aged children. However, this relationship remains understudied among Hispanic preschool-aged children, who are vulnerable to poor dietary habits and low cognitive development due to socioeconomic, cultural, and structural disparities. OBJECTIVE: This longitudinal study evaluated whether the diet quality of preschool-aged children would be associated with executive functions (EFs) in later childhood. DESIGN: This is a secondary analysis of a longitudinal study of Hispanic preschool-aged children (age 4 and 5 years) at baseline (Time 1) and 18 months (Time 2). PARTICIPANTS AND SETTING: This study included 185 mother-child dyads with complete data at Time 1, recruited through Head Start centers in Houston, TX, beginning in 2011. MAIN OUTCOME MEASURES: Mothers reported on their child's dietary intake via 3 24-hour recalls, which was used to calculate Healthy Eating Index (HEI)-2010 component and total scores. Laboratory tasks assessed cold EFs (tapping and Flexible Item Selection Tasks) and hot EFs (delay of gratification and gift-wrapping tasks). Whereas higher scores on tapping, Flexible Item Selection Task, and delay of gratification tasks represent a high EF, higher scores in gift-wrapping task represent a low EF. STATISTICAL ANALYSES PERFORMED: Hierarchical linear regression analyses assessed the relationship between diet quality, as measured by HEI-2010 total and component scores, at Time 1 (independent variables) and EF outcomes (dependent variables) at Time 2, controlling for child sex, age, body mass index z score, and EF at Time 1. RESULTS: HEI-2010 component score for fatty acids (b = -.13
P = .04) and seafood and plant proteins (b = .09
P = .05), were respectively related to later cold and hot EFs of Hispanic preschool-aged children. Other HEI components or the overall score did not predict EFs. CONCLUSIONS: This study shows that specific HEI components support cold and hot EFs development among Hispanic preschool-aged children, but total HEI-2010 score does not. Experimental research is needed to assess the influence of dietary interventions on cognitive development of Hispanic preschool-aged children.