Breastfeeding provides passive and likely long-lasting active immunity

Area of Science:

• Immunology
• Pediatrics
• Public Health

Background:

• Breastfeeding is recognized for its role in infant nutrition and development.
• The protective mechanisms of human milk against infections and immune-related diseases require detailed understanding.
• Long-term effects of breastfeeding on immune system maturation and disease prevention are areas of active research.

Purpose of the Study:

• To review the mechanisms by which breastfeeding protects against infections during and after lactation.
• To explore the potential of breastfeeding in preventing immunologic diseases, including allergies.
• To elucidate the role of human milk components in immune system stimulation.

Main Methods:

• Comprehensive literature review of studies on breastfeeding and infant immunity.
• Analysis of data from MEDLINE searches, textbooks, peer-reviewed journals, and conference reports.
• Inclusion of research in English, French, German, and Spanish over a 30-40 year period.

Main Results:

• Human milk contains secretory IgA antibodies and lactoferrin, providing passive immunity against various infections like diarrhea and respiratory illnesses.
• Breast milk components are anti-inflammatory and protect without causing inflammation.
• Evidence suggests protection extends beyond lactation, potentially reducing risks of infections, certain cancers, and autoimmune diseases, with duration of breastfeeding correlating with enhanced protection.
• Breastfed infants may exhibit improved vaccine responses and immune system stimulation due to milk factors like lymphocytes and cytokines.

Conclusions:

• Breastfeeding provides passive protection against infections during lactation.
• Human milk possesses a unique ability to actively stimulate the infant's immune system.
• These immune-stimulating effects may lead to long-term health benefits for the offspring.