Lipids

, Volume 27, Issue 11, pp 879–885

n−3 Fatty acid requirements of the newborn

  • Sheila M. Innis
Article

DOI: 10.1007/BF02535867

Cite this article as:
Innis, S.M. Lipids (1992) 27: 879. doi:10.1007/BF02535867

Abstract

Whether docosahexaenoic acid (22∶6n−3) is an essential nutrient for term or preterm infants, or if not, the quantity of dietary linolenic acid (18∶3n−3) needed to support sufficient synthesis of 22∶6n−3 for assimilation in the central nervous system is unknown. Infants fed formulas have lower plasma and red blood cell (RBC) levels of 22∶6n−3 than breast fed infants. No relationship between the intake of 18∶3n−3 in formula (0.8 or 4.5% of fatty acids, 18∶2n−6/18∶3n−3 ratio 35∶1 or 7∶1, respectively) and the infant's RBC 22∶6n−3 was found. Premature infants (<33 wk gestation) also showed a decrease in RBC 22∶6n−3 during feeding with formula containing 18∶3n−3 as the only n−3 fatty acid. However, a marked decrease in plasma and RBC 22∶6n−3 occurred between premature birth and the start of full enteral feeding at 1–2 wk of age. This was not reversed by breast milk or formula feeding. Piglets, which are appropriate for studies of infant lipid metabolism, had decreased brain synaptic plasma membrane, retina and liver 22∶6n−3 and increased 22∶5n−6 when fed formula with 0.8% fatty acids (0.3% of kcal) as 18∶3n−3. Formula with 4.0% fatty acids (1.7% of kcal) as 18∶3n−3 resulted in similar accretion of 22∶6n−3 in the organs compared to milk fed animals. The studies suggest the dietary requirement for 18∶3n−3 in term animals in energy balance exceeds 0.3% diet kcal. Studies in the premature infants suggest 18∶3n−3 may be oxidized rather than desaturated to 22∶6n−3 if energy requirements are not met, and that due to early lipid restriction and later rapid growth, premature infants may have higher dietary n−3 requirements than term infants.

Abbreviations

CNS

central nervous system

ERG

electroetinograph

LCP

long-chain polyunsaturated fatty acids of carbon chain ≥20 and containing >2 double bonds

LDL

low density lipoprotein

PC

choline phospholipids

PE

ethanolamine phospholipids

RBC

red blood cell(s)

UI

unsaturation index

Copyright information

© American Oil Chemists’ Society 1992

Authors and Affiliations

  • Sheila M. Innis
    • 1
  1. 1.Department of PaediatricsUniversity of British Columbia, The Research CentreVancouverCanada