In a population-based cohort study published in The American Journal of Clinical Nutrition, researchers found that higher maternal consumption of nuts and seafood during pregnancy was associated with improved neuropsychological function in children from ages 4 to 15.1 A complementary study published in European Child & Adolescent Psychiatry reported that maternal intake of nuts and fish was linked to reduced risky decision-making behaviors in children at age 11.2
The study evaluated a sample of more than 1,700 mother-child pairs from four Spanish regions was analyzed. Maternal diet was analyzed using a food frequency questionnaire, while the children’s neuropsychological function was assessed through standardized tests measuring reaction time and variability (attention), working memory, and fluid intelligence.
While neither study focused exclusively on walnuts, both contribute to the broader evidence supporting the role of including nutrient-dense foods, such as nuts, as part of a healthy prenatal diet.
Key takeaways:
- Children whose mothers consumed more nuts and seafood during pregnancy scored higher on measures of attention, working memory, and executive function throughout childhood and adolescence.
- These children were also less likely to make impulsive, high-risk decisions in early adolescence.
- Omega-3 fatty acids- abundant in walnuts and fatty fish- were identified as a key nutrient associated with these benefits. Walnuts are the only tree nut that is an excellent source of the plant-based omega-3 fatty acid ALA (2.7 grams/ounce).
References:
- Pinar-Martí A, Ayala-Aldana N, Ruiz-Rivera M, Lertxundi N, Subiza-Pérez M, González-Safont L, Vioque J, Riaño-Galán I, Rodríguez-Dehli C, Iglesias-Vázquez L, Arija V, Fernández-Barrés S, Romaguera D, Pascual-Rubio V, Fabregat-Sanjuan A, Healy D, Basagaña X, Vrijheid M, Guxens M, Foraster M, Julvez J. Maternal prenatal nut and seafood consumption and child neuropsychological function from 4 to 15 years of age: a population-based cohort study. Am J Clin Nutr. 2025 May 5:S0002-9165(25)00249-7. doi: 10.1016/j.ajcnut.2025.04.032. Epub ahead of print. PMID: 40334748.
- Rivera MR, Pinar-Martí A, Babarro I, Ibarluzea J, Vioque J, Llop S, Fernández-Somoano A, Tardón A, Pascual-Rubio V, Fabregat-Sanjuan A, Fernández-Barrés S, Romaguera D, Guxens M, Julvez J. Maternal nut and fish consumption during pregnancy and child risky decision-making at 11 years old. Eur Child Adolesc Psychiatry. 2025 Jun 10. doi: 10.1007/s00787-025-02750-5. Epub ahead of print. PMID: 40493090.
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