Impact of omega-3 fatty acid DHA and EPA supplementation in pregnant or breast-feeding women on cognitive performance of children: systematic review and meta-analysis

Abstract

Introduction The omega-3 long-chain polyunsaturated fatty acids docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) are important for brain development and cognitive performance. Because they are semi-essential fatty acids, they must be obtained from food. However, the dietary reference intakes of DHA and EPA have not yet been established. In women, a low DHA and/or EPA serum level during pregnancy or breastfeeding might negatively affect their children. For this study, we conducted a systematic review and meta-analysis of randomized control trials on the association between the consumption of fish oil supplements in pregnant and/or breastfeeding women and the cognitive performance of their children. Methods The PubMed, Embase, and Central literature databases were systematically searched. We included and extracted relevant studies in duplicate and assessed study quality. Cognitive outcomes were grouped according to published criteria and according to time elapsed after the intervention. We performed fixed-effects meta-analyses for each cognitive outcome and for birth weight. We assessed potential confounding with meta-regressions and sensitivity analyses. Results A total of 11 trials were included. No significant association was found between DHA/EPA supplementation and any of the assessed cognitive parameters or birth weight. Discussion Our results confirm previous reviews on the studied topic. Reasons for inconclusive results may be small sample sizes for each assessed category, questionable quality of included studies, and the difficulty of reliably measuring cognitive performance in small children. Blood levels of omega-3 long-chain polyunsaturated fatty acids were mostly not comparable. Furthermore, the influence of genetic and environmental factors could not be assessed. Studies in this field should address such shortcomings.

Polycystic Ovary Syndrome in Insulin-Resistant Adolescents with Obesity: The Role of Nutrition Therapy and Food Supplements as a Strategy to Protect Fertility

“…DHA is particularly important for fetal brain development, optimal development of cognitive abilities and visual acuity [179].…”

II Consensus of the Brazilian Nutrology Association on DHA recommendations during pregnancy, lactation and childhood

“…Lehner et al [142] report that the reasons for inconclusive results on the supplementation of pregnant and lactating women may be small samples for each category evaluated, questionable quality of the included studies and the difficulty of reliably measuring cognitive performance in young children. Blood levels of n-3 LC-PUFAs are not mostly comparable.…”

Fatty acids: facts vs. fiction

“…The significance of these two essential fatty acids is mainly due to the fact that humans can produce the physiologically important fatty acids arachidonic acid (AA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) from them (Figure 4). However, the synthesis of AA, EPA and DHA does not usually occur in sufficient quantities, which is why these are sometimes also considered essential or at least semi-essential [100,101].…”