Long-Term Follow-Up Study On The Impact Of Prenatal DHA Supplementation On Behavioral Functioning in School-Aged Children

Recent years have seen an increase in studies examining how maternal nutrient supplementation affects offspring neurodevelopment. Among these nutrients, docosahexaenoic acid (DHA), an omega-3 fatty acid, has garnered attention for its potential role in fetal brain development. The article by Jacqueline F. Gould et al., published in Nutrients (2021, Vol. 13, Issue 9), titled "The Influence of Prenatal DHA Supplementation on Individual Domains of Behavioral Functioning in School-Aged Children: Follow-Up of a Randomized Controlled Trial," offers significant insights into the impact of prenatal DHA supplementation on behavioral functioning in school-aged children.

Background and Methods

This study is based on a multicenter, double-blind, randomized controlled trial that recruited singleton pregnant women less than 21 weeks gestation. Participants were randomly assigned to receive either 800 mg of DHA or a placebo daily until birth. When the children reached seven years old, parents completed several assessment tools including the Strengths and Difficulties Questionnaire (SDQ), the Behavior Rating Inventory of Executive Function (BRIEF), and the Conners 3rd Edition Attention Deficit Hyperactivity Disorder (ADHD) Index to evaluate children's behavioral and executive function outcomes (Gould et al., 2021). A total of 543 mother-child pairs participated in this follow-up study, representing 85% of those eligible.

Results Analysis

Contrary to expectations, parental reports indicated that children in the DHA group scored worse in multiple behavioral domains compared to the placebo group. Specifically, mean scores on the BRIEF and its Global Executive Composite were 2.38 points higher in the DHA group than in the placebo group (p=0.01), with more children in the DHA group having Global Executive Composite scores in the at-risk range (ARR 1.48, 95% CI 1.07 to 2.05; p=0.02) (Gould et al., 2021). These effects appeared primarily driven by negative impacts of DHA supplementation in male subjects, although the gender interaction did not reach statistical significance (p=0.08).

Additionally, the study found that scores on the Inhibit and Shift scales were significantly higher in the DHA group compared to the placebo group, indicating poorer performance in these areas. Further stratified analysis by gender showed that males, but not females, in the DHA group had significantly higher scores on the Shift scale compared to the placebo group (AMD 3.89, 95% CI 1.37 to 6.41; p<0.01; interaction p=0.04) (Gould et al., 2021).

While previous research generally supports the benefits of DHA for fetal and early infant brain development, this study suggests that high-dose prenatal DHA supplementation may not always lead to positive outcomes in specific behavioral function domains, particularly those related to executive functions. Importantly, the findings highlight the importance of individual differences, especially regarding gender, suggesting future studies should focus more closely on different responses to nutritional interventions across populations.

In conclusion, the paper in Nutrients not only expands our understanding of the long-term effects of prenatal DHA supplementation but also underscores the need for comprehensive and nuanced considerations before promoting any nutritional intervention. As the authors noted, "Our study reveals the complexity and variability of the impact of prenatal DHA supplementation on behavioral functioning in school-aged children, providing new perspectives and challenges for future research in this field" (Gould et al., 2021).

References:

Gould, J. F., Anderson, P. J., Yelland, L. N., Gibson, R. A., & Makrides, M. (2021). The Influence of Prenatal DHA Supplementation on Individual Domains of Behavioral Functioning in School-Aged Children: Follow-Up of a Randomized Controlled Trial. Nutrients, 13(9), 2996. https://doi.org/10.3390/nu13092996