Abstract
The need for long-chain polyunsaturated fatty acids (LC-PUFA), such as docosahexaenoic acid (DHA, C22:6n3) and arachidonic acid (AA, C20:4n6), in the diet of infants in order to achieve full developmental potential is a matter of intense investigation by several research groups worldwide. It has been widely reported that breast-fed infants perform better on tests that assess neurodevelopmental outcomes than do formula-fed infants. Although human milk contains LC-PUFA that are absent from formula, it is necessary to demonstrate that any beneficial effects of human milk on infant development are purely attributed to the presence of LC-PUFA in human milk and their absence from formula to establish causality. The hypothesis that dietary DHA is associated with developmental outcome needs to be plausible; the effect must be consistent, specific, and independent of confounding factors. The hypothesis is certainly plausible. DHA is avidly incorporated and retained in brain cerebral phospholipids, and a most consistent finding has been the lower level of cerebral DHA in the brains of formula-fed infants (receiving no DHA) relative to those fed human milk (receiving DHA). The formula-fed infants in these studies were generally fed formulas with adequate a-linolenic acid levels, and this may indicate a nutritional requirement for preformed DHA.
Several studies have compared the effects of breast-and formula-feeding on functional outcomes in preterm and term infants. While many of the outcomes have involved visual testing, others have attempted more global assessments. The results have shown differences in favor of breast-feeding but have been colored by the strong socioeconomic differences between mothers who choose to breast feed and those who choose formula-feeding.
Randomized clinical trials involving preterm infants have shown a clear requirement for DHA for full visual and neural development. These results are consistent with primate studies. However, intervention studies with term infants that have attempted to improve the DHA supply of infant formula and hence infant development have not yielded consistent results. Some randomized studies have demonstrated improved visual and developmental indices in supplemented over unsupplemented infants, others have failed to demonstrate an effect. This disparity could be due to methodological and environmental differences. It is also notable that supplemental regimens have not specifically added DHA and have included other LC-PUFA, raising the question as to the specificity of the effect. However, only tissue DHA levels have consistently correlated with outcomes.
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Gibson, R.A., Makrides, M. (2001). Long-Chain Polyunsaturated Fatty Acids in Breast Milk. In: Newburg, D.S. (eds) Bioactive Components of Human Milk. Advances in Experimental Medicine and Biology, vol 501. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1371-1_46
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