Nutritive and Bioactive Proteins in Breastmilk

Area of Science:

• Human Nutrition
• Infant Development
• Biochemistry

Background:

• Breast milk protein is crucial for infant growth, providing indispensable amino acids for synthesis and tissue repair.
• Protein content and quality in breast milk change during lactation, with higher concentrations in early stages.
• Low-birth-weight infants have elevated protein requirements compared to full-term infants.

Purpose of the Study:

• To review the role of indispensable amino acids from breast milk protein in infant growth and development.
• To explore the diverse bioactive functions of proteins in breast milk beyond basic nutrition.
• To discuss advancements in infant formula development based on understanding breast milk protein composition.

Main Methods:

• Literature review of studies on breast milk protein composition and function.
• Analysis of protein requirements for infant growth, particularly for low-birth-weight infants.
• Examination of research on bioactive proteins and their proposed functions in infant development.

Main Results:

• Breast milk protein provides essential amino acids critical for infant growth and replacement of bodily losses.
• Bioactive proteins in breast milk offer microbial protection, immune support, digestive aid, gut development, and nutrient transport.
• Specific proteins like lactoferrin and secretory IgA (sIgA) have well-documented functions, while others require further investigation.

Conclusions:

• Understanding breast milk protein evolution informs the creation of improved infant formulas with optimized protein quality and concentration.
• Breast milk proteins play multifaceted roles essential for infant health, immunity, and development.
• Continued research is needed to fully elucidate the functions of all bioactive milk proteins.