The Importance of DHA During Pregnancy

Role of DHA in Fetal Development

Adequate intake of docosahexaenoic acid (DHA), an omega-3 fatty acid, is crucial during pregnancy as it serves as a fundamental component for the development of the fetal brain and retina. Recent research conducted in Canada explores the long-term effects of fetal DHA levels on neurocognitive development in childhood, particularly at the age of five.

What is DHA?

Docosahexaenoic acid, or DHA, is essential for various bodily functions, including oxygen transport, energy storage, cell membrane integrity, and the regulation of inflammation and cell proliferation. As the human body cannot synthesize DHA, it must be obtained through dietary sources such as fatty fish, including halibut, herring, mackerel, salmon, sardines, trout, oysters, and fresh tuna. Additionally, some eggs are fortified with omega-3 fatty acids, and fish oil supplements have become widely available.

Recommended DHA Intake

Current health guidelines suggest that pregnant women should consume a minimum of 200 mg of DHA daily throughout their pregnancy. This recommendation is based on studies indicating that insufficient DHA during pregnancy is linked to visual, neural, and behavioral deficits in infants, which cannot be corrected with supplementation after birth. Many prenatal vitamins now include 200 mg-300 mg of DHA.

Recent Research Findings

Study Overview

A recent study published in The British Journal of Nutrition, conducted by researchers at the University of British Columbia, aimed to determine whether the effects of fetal DHA deficiency on infant development persist into early childhood. The study followed children whose mothers had participated in a randomized, double-blind, placebo-controlled trial assessing the impact of DHA deficiency during pregnancy on the infants’ central nervous system (CNS). Mothers received either 400 mg of DHA daily or a placebo.

Assessment of Child Development

The children, now aged five to six years, underwent various age-appropriate assessments, including the Kaufman Assessment Battery for Children. The researchers discovered that the developmental impacts of DHA insufficiency during gestation, observed up to 18 months, may have diminished or been obscured by postnatal dietary influences or other factors by the time the children reached 5.75 years. Nonetheless, maternal DHA intake showed a positive correlation with the children’s performance on tests related to language, attention, and short-term memory.

Relationship Between Maternal and Child DHA Levels

The study also found that the DHA levels in children closely mirrored those of their mothers, complicating the ability to discern whether the observed effects were due to maternal supplementation or the children’s own dietary practices.

Conclusions and Implications

Significance of Maternal DHA Intake

The research team concluded that sufficient DHA intake during pregnancy may enhance children’s language skills, behavior, and memory. However, the study underscores the complexity of understanding long-term developmental outcomes, particularly regarding whether these effects are attributable to maternal dietary intake during pregnancy or the child’s diet after birth.

References

(1) Mulder, K. A., Elango, R., & Innis, S. M. (2018). Fetal DHA inadequacy and the impact on child neurodevelopment: a follow-up of a randomized trial of maternal DHA supplementation in pregnancy. British Journal of Nutrition, 1-9. doi:10.1017/S0007114517003531
(2) Coletta, J. M., Bell, S. J., & Roman, A. S. (2010). Omega-3 fatty acids and pregnancy. Reviews in obstetrics and gynecology, 3(4), 163.
(3) U.S. Food and Drug Administration. (2014). Fish: What pregnant women and parents should know. Retrieved from http://www.fda.gov/Food/FoodborneIllnessContaminants/Metals/ucm393070.htm