Energy expenditure in human milk- versus formula-fed preterm infants

Area of Science:

• Neonatal Nutrition
• Pediatric Metabolism
• Infant Physiology

Background:

• Preterm infants require specialized nutrition for optimal growth and development.
• Understanding energy expenditure (EE) is crucial for managing nutritional needs in premature infants.
• Human milk and preterm infant formula differ in composition, potentially affecting infant metabolism.

Purpose of the Study:

• To compare the energy expenditure (EE) of preterm infants when fed mother's milk versus preterm infant formula.
• To investigate the metabolic impact of different feeding strategies in premature infants.

Main Methods:

• A prospective, randomized crossover study involving 13 healthy preterm infants.
• Infants received alternating 24-hour periods of human milk and preterm infant formula.
• Energy expenditure was measured using indirect calorimetry during sleep, pre-feeding, during feeding, and post-feeding.

Main Results:

• Energy expenditure was significantly lower in preterm infants fed human milk compared to preterm infant formula across all measurement periods (prefeeding, during feeding, postfeeding).
• Statistical significance (P<.05) was maintained for prefeeding and during-feeding measurements.
• After correcting for actual energy intake, all observed differences in EE reached statistical significance (P<.05).

Conclusions:

• Preterm infants exhibit lower energy expenditure when nourished with breast milk compared to preterm infant formula.
• This suggests a potentially greater metabolic efficiency or different substrate utilization with human milk in preterm infants.