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[Sodium and potassium metabolism in infancy]
G Schulz-Lell1, K Dörner, H D Oldigs
1Abteilung Allgemeine Pädiatrie, Universitäts-Kinderklinik Washibgton, D.C.
Summary
Infant formula adapted for sodium and potassium levels ensures adequate mineral balance in formula-fed infants, comparable to breastfed infants. Further sodium reduction in formulas is not recommended.
Area of Science:
- Pediatric Nutrition
- Mineral Metabolism
- Infant Formula Composition
Context:
- Infant formula nutrient recommendations often mirror human milk concentrations.
- Industry has adjusted sodium and potassium levels in formulas to match human milk.
- The impact of these adjustments on infant mineral balance requires investigation.
Purpose:
- To assess the sodium and potassium balance in breast-fed versus formula-fed infants.
- To determine if adapted infant formulas maintain adequate mineral homeostasis.
Summary:
- Sodium and potassium balances were measured in 16 term male infants (3-17 weeks).
- Ten infants were breast-fed, and six received an adapted formula.
- Formula-fed infants had higher sodium intake but similar sodium retention compared to breast-fed infants; potassium intake was higher, with similar retention.
Impact:
- Adapted infant formulas provide adequate sodium and potassium supply for artificially fed infants.
- Current sodium concentrations in adapted formulas appear appropriate.
- This study supports the safety and efficacy of current infant formula mineral content.