Formula with reduced content of improved,partially hydrolyzed protein and probiotics: infant growth and health

Objective

This study determined growth and stool characteristics of infants fed a formula with reduced content of a partially hydrolyzed protein of improved quality and assessed the effect of the addition of a probiotic on infant growth and health.

Design, methods

The double-blind study involved three formulas: a reduced protein (1.90 g/100 kcal) formula (formula RP), the same formula with Bifidobacterium lactis (formula RP+P), and a higher-protein (2.39 g/100 kcal) control formula (C). Protein of the formulas consisted of partially hydrolyzed modified whey proteins. Normal term infants were randomly assigned to one of the formulas, which were fed from soon after birth to 4 months of age; 88 infants completed the study. Growth was measured and formula tolerance, stool characteristics, and illness incidence were recorded.

Results

All three formulas supported growth equally well. Plasma concentrations of urea and of threonine and proline were markedly (significantly) lower with RP and RP+P than with C. No differences in feeding-related behaviors were noted, but stools were softer with formula C than with the other formulas. Infants fed RP+P had significantly fewer episodes of diarrhea (0.21 episodes) than infants fed RP (0.41 episodes) or C (0.91 episodes).

Conclusion

A reduced-protein formula with and without added probiotics (B. lactis) supports normal growth of infants during the first 4 months. In addition, it leads to lower plasma levels of urea, threonine, and proline. Supplementation of the formula with Bifidobacterium lactis offers protection against diarrheal illness.