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The Essentiality of Arachidonic Acid in Infant Development
Kevin B Hadley1, Alan S Ryan2, Stewart Forsyth3
1DSM Nutritional Products, 6480 Dobbin Road, Columbia, MD 21045, USA. kevin.hadley@dsm.com.
Insights
Arachidonic acid (ARA) is crucial for infant growth, brain development, and immune function. Ensuring adequate ARA levels, balanced with DHA, is vital for infant health and development.
Area of Science:
- Nutritional Science
- Developmental Biology
- Biochemistry
Background:
- Arachidonic acid (ARA, 20:4n-6) is an essential n-6 polyunsaturated fatty acid derived from linoleic acid.
- ARA is vital for infant development, present in human milk and accumulated in infant tissues.
- Infants cannot synthesize sufficient ARA from linoleic acid alone to meet metabolic demands.
Purpose of the Study:
- To review the essential role of Arachidonic Acid (ARA) in infant development.
- To discuss the importance of ARA in infant growth, brain development, and immune response.
- To examine the optimal amounts and ratios of ARA and DHA in infant formulas.
Main Methods:
- Literature review of animal and human studies on ARA's role in infant development.
- Analysis of scientific evidence regarding ARA synthesis and dietary requirements.
- Evaluation of studies on ARA and DHA supplementation in infant formulas.
Main Results:
- ARA is a precursor to eicosanoids, crucial for immunity and immune response.
- Studies confirm ARA's critical role in infant growth, brain development, and overall health.
- Balancing ARA and DHA is important, as excessive DHA may diminish ARA's benefits.
Conclusions:
- Preformed ARA is necessary for infants due to limited synthesis capacity.
- Adequate ARA and DHA levels, along with their ratio, are critical for infant formula.
- Continued research and evidence-based recommendations are needed for optimal infant nutrition.
Abstract:
Arachidonic acid (ARA, 20:4n-6) is an n-6 polyunsaturated 20-carbon fatty acid formed by the biosynthesis from linoleic acid (LA, 18:2n-6). This review considers the essential role that ARA plays in infant development. ARA is always present in human milk at a relatively fixed level and is accumulated in tissues throughout the body where it serves several important functions. Without the provision of preformed ARA in human milk or infant formula the growing infant cannot maintain ARA levels from synthetic pathways alone that are sufficient to meet metabolic demand. During late infancy and early childhood the amount of dietary ARA provided by solid foods is low. ARA serves as a precursor to leukotrienes, prostaglandins, and thromboxanes, collectively known as eicosanoids which are important for immunity and immune response. There is strong evidence based on animal and human studies that ARA is critical for infant growth, brain development, and health. These studies also demonstrate the importance of balancing the amounts of ARA and DHA as too much DHA may suppress the benefits provided by ARA. Both ARA and DHA have been added to infant formulas and follow-on formulas for more than two decades. The amounts and ratios of ARA and DHA needed in infant formula are discussed based on an in depth review of the available scientific evidence.
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