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Functional development of fat absorption in term and preterm neonates strongly correlates with ability to absorb

Edmond H H M Rings1, Deanne M Minich, Roel J Vonk

  • 1Division of Neonatology, Department of Pediatrics, Isala Hospitals, Sophia Hospital Zwolle, 8000 GK Zwolle, The Netherlands.

Pediatric Research
|January 5, 2002
PubMed

Insights

Neonatal fat absorption maturation is linked to improved long-chain fatty acid absorption. This study in preterm and term infants shows increased capacity to absorb fatty acids correlates with overall fat absorption efficacy.

Area of Science:

  • Neonatal physiology
  • Gastroenterology
  • Nutritional science

Background:

  • Fat absorption is crucial for infant growth and development.
  • Maturation of fat digestion and absorption processes in neonates is not fully understood.
  • Distinguishing between hydrolysis and absorption capacities is key to understanding fat absorption efficacy.

Purpose of the Study:

  • To investigate the functional relationship between fat digestion and absorption in neonatal development.
  • To determine if increased fat absorption efficacy is due to enhanced triacylglycerol hydrolysis or long-chain fatty acid absorption.
  • To correlate these capacities with postconceptional age (PCA) in preterm and term infants.

Main Methods:

  • Assessed intestinal triacylglycerol hydrolysis and long-chain fatty acid absorption capacity in neonates.
  • Utilized stable isotope tracers ([1-(13)C]palmitate and [1-(13)C]stearate) administered enterally.
  • Measured serum concentrations of labeled fatty acids to evaluate digestive and absorptive functions.
  • Correlated these functional capacities with measured fat absorption percentages or fecal fat excretion.

Main Results:

  • Fat absorption efficacy significantly increased with postconceptional age in preterm (formula-fed) and term infants.
  • Serum concentrations of both [1-(13)C]palmitate and [1-(13)C]stearate strongly correlated with fat absorption efficacy.
  • Both tracer concentrations were also highly correlated with postconceptional age.
  • The capacity to absorb long-chain fatty acids showed a strong correlation with overall fat absorption.

Conclusions:

  • The functional development of fat absorption in neonates is primarily related to an increased capacity to absorb long-chain fatty acids.
  • Enhanced absorption of fatty acids, rather than hydrolysis, appears to be the main driver of improved fat absorption efficacy during maturation.
  • These findings provide insights into the physiological mechanisms underlying neonatal fat assimilation.

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