Review Article
The Functional Significance of DHA During Toddlerhood and Its Role in Brain Development, Cognitive Function, Behavioral Outcomes, and Immunomodulation
Issue:
Volume 12, Issue 2, June 2026
Pages:
55-62
Received:
22 April 2026
Accepted:
3 May 2026
Published:
18 May 2026
DOI:
10.11648/j.ajp.20261202.11
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Views:
Abstract: Docosahexaenoic acid (DHA), a long-chain omega-3 polyunsaturated fatty acid, is a vital structural component of the brain and retina and plays an essential role during the first 1,000 days of life, including toddlerhood. This developmental period is marked by rapid brain growth, synaptogenesis, myelination, and neural circuit refinement, all of which require an adequate supply of essential nutrients. Among these, DHA is especially important because it is highly concentrated in neuronal membranes, where it helps maintain membrane fluidity, supports synaptic signaling, and promotes efficient communication between nerve cells. DHA contributes significantly to neurodevelopment by supporting neurite outgrowth, neuronal differentiation, and cell survival. These processes are critical during toddlerhood, when children experience major advances in language, memory, learning, motor skills, and emotional regulation. Because DHA influences the structural and functional maturation of the brain, it is often associated with improved visual and cognitive development. Experimental studies strongly support its biological importance in brain development, showing that DHA enhances synaptic plasticity and protects neurons from injury. Human studies also suggest benefits, particularly in visual acuity, attention, and certain cognitive functions, although the outcomes of DHA supplementation trials are not always consistent. In addition to its effects on cognition, DHA may also influence behavioral outcomes. Adequate DHA status has been linked with better attention, emotional balance, and adaptive behavior, likely because it supports the maturation of brain regions involved in self-regulation and social functioning. However, clinical evidence in this area remains mixed, and more toddler-specific research is needed to confirm these effects. DHA also has an important immunomodulatory role. It serves as a precursor for bioactive lipid mediators such as resolvins, protectins, and maresins, which help reduce excessive inflammation and promote immune homeostasis. By modulating cytokine production and inflammatory signaling pathways, DHA may support immune maturation during early life. Overall, DHA is functionally significant during toddlerhood because of its combined roles in brain development, cognitive performance, behavioral regulation, and immune function. However, the magnitude of its benefits may vary depending on dietary intake, baseline nutritional status, timing, and dose of supplementation. Thus, DHA should be considered a key nutrient for supporting healthy early childhood development.
Abstract: Docosahexaenoic acid (DHA), a long-chain omega-3 polyunsaturated fatty acid, is a vital structural component of the brain and retina and plays an essential role during the first 1,000 days of life, including toddlerhood. This developmental period is marked by rapid brain growth, synaptogenesis, myelination, and neural circuit refinement, all of whi...
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,
Mizanur Rahman
