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A decade after pregnant women participated in a clinical trial involving fish oil supplementation, advanced brain imaging of their offspring reveals subtle yet distinct differences in metabolic activity. According to findings from a randomized controlled trial published in Translational Psychiatry, taking omega-3 polyunsaturated fatty acids (PUFAs) during late pregnancy leads to long-term alterations in specific childhood brain metabolic markers.
The research drew data from the Copenhagen Prospective Studies on Asthma in Childhood 2010 (COPSAC2010) cohort, which originally enrolled 700 mother-child pairs. During the trial, pregnant mothers were randomly assigned at 24 weeks of gestation to consume either a daily 2.4-gram dose of fish oil—containing 55% eicosapentaenoic acid (EPA) and 37% docosahexaenoic acid (DHA)—or an olive oil placebo until one week after delivery.
When the children reached approximately 10.3 years of age, 487 participants underwent 3 Tesla magnetic resonance imaging (MRI) scans. Following rigorous data processing and quality assurance, researchers analyzed usable brain metabolic metrics from 460 children. The neuroimaging protocol utilized phase-contrast mapping MRI to measure total cerebral blood flow (CBF), susceptibility-based oximetry MRI combined with blood tests to evaluate the global cerebral metabolic rate of oxygen (CMRO2), and magnetic resonance spectroscopy to assess precuneus tissue lactate levels.
The findings demonstrated that children whose mothers received prenatal fish oil supplementation exhibited minor but statistically significant reductions in both global cerebral blood flow and oxygen consumption compared to the placebo cohort. Specifically, prenatal omega-3 exposure was associated with a decrease in CBF of 2.3 mL/100 g/min and a reduction in CMRO2 of 17.38 µmol/100 g/min. However, supplementation produced no significant effect on tissue lactate levels in the precuneus.
To contextualize these observations, researchers compared the children's brain metrics with scanning data from 248 adults evaluated on identical equipment. In human development, childhood brain metabolism typically peaks around age 7 before declining gradually toward adult levels. Consequently, the lower metabolic values recorded in the supplementation group suggest a shift toward a more mature metabolic profile. Nevertheless, researchers emphasized that these metabolic changes did not correlate with measurable differences in cognitive performance or psychopathological assessments, such as ADHD or autism spectrum metrics.
While the study offers novel insights into how maternal nutrition can exert decade-long influences on offspring neurobiology, the authors note several limitations, including single-center design and the reliance on global rather than regional metabolic measurements. Thus, whether these metabolic shifts indicate accelerated brain maturation or confer direct functional benefits remains a topic for further investigation.
Source: News-Medical