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Protein requirements of infants: a reexamination of concepts and approaches
1Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Canada.
Insights
Protein requirements for 3-4 month old infants are likely overestimated. Simulation analyses suggest a lower, more accurate protein intake estimate of 1.1 g/kg/day, aligning with adequate nutrition from breast milk or formula.
Area of Science:
- Nutritional Science
- Pediatrics
- Infant Nutrition
Background:
- Established protein requirement estimates for 3-4 month old infants by FAO/WHO/UNU (1.47 +/- 0.26 g/kg/day) may be inaccurate.
- Previous assessments might have misinterpreted breast milk data and applied adult requirement concepts to infants.
Purpose of the Study:
- To re-evaluate and propose a more accurate protein requirement estimate for infants aged 3-4 months.
- To highlight potential discrepancies in infant versus adult nutritional requirement estimations.
Main Methods:
- Utilized simulation analyses to model protein requirements.
- Compared simulation-derived estimates with established nutritional adequacy of breast milk and infant formulas.
Main Results:
- Simulation analyses suggest a revised protein requirement estimate of 1.1 +/- 0.1 - 0.2 g/kg/day for 3-4 month old infants.
- This revised estimate aligns with the known protein content of breast milk (16 g/1000 kcal) and standard infant formulas (17 g/1000 kcal), which provide adequate nutrition.
Conclusions:
- Current protein requirement estimates for young infants are likely overestimated.
- A lower protein intake, supported by simulation data and breast milk composition, is proposed as more appropriate.
- Epidemiological approaches should be integrated into future infant nutritional requirement estimations.
Abstract:
Estimates of protein requirements of infants aged 3-4 mo by FAO/WHO/UNU (1.47 +/- 0.26 g.kg-1.d-1 as crude protein, N X 6.25) are judged to be overestimates. From simulation analyses we suggest that 1.1 +/- 0.1 - 0.2 g.kg-1.d-1 is a more reasonable estimate. This is consistent with statements that 1) breast milk that provides an average of 16 g protein/1000 kcal or a fixed-composition formula that contains 17 g protein/1000 kcal is adequate for essentially all such infants and 2) average protein intakes from that milk or formula would be approximately 1.65 or 1.75 g.kg-1.d-1, close to current average requirements estimates. It appears that there has been a difference in the concepts of requirement usually applied to infants and to adults and a systematic misinterpretation of breast-milk data in estimating requirements. A plea is issued for the application of epidemiologic approaches as a part of requirement estimation.