Objectives: We sought to investigate the cognition of preschoolers in rural China and examine the relationship between dietary diversity and cognition.
Methods: We performed a cross-sectional survey analysis. In 1334 preschoolers ages 3 to 5, from 26 preschools in two nationally designated poverty counties in Hunan Province in China, we calculated the dietary diversity score (DDS) using a 24-h recall method. To measure children's cognitive ability, we assessed the Working Memory Index and Verbal Comprehension Index on the Mandarin-language version of the Wechsler Preschool and Primary Scale of Intelligence, Fourth Edition. Multiple linear regression models were used to estimate the association between DDS and cognitive test scores.
Results: A total of 22% of children had a Working Memory Index that was either extremely low or borderline, and 31% of children had a Verbal Comprehension Index that was either extremely low or borderline. The mean (± SD) DDS was 5.65 ± 1.30. Those preschoolers with medium DDS (5 or 6) or high DDS (7 to 9) scored higher on both Working Memory Index-respectively, mean difference (MD), 1.327; 95% confidence interval (CI), 0.246-3.901; and MD, 2.067, 95% CI, 0.261-4.641-and Verbal Comprehension Index-MD, 0.168; 95% CI, 0.072-2.135; and MD, 0.398; 95% CI, 0.032-2.137-than did those with low DDS (0 to 4).
Conclusions: Consuming a more diverse diet may contribute to better cognition in preschoolers. Future research is needed to better understand the possible causal effect of dietary diversity on cognitive development.
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