Maternal Lifestyle Factors Affecting Breast Milk Composition and Infant Health: A Systematic Review

Breast milk is a dynamic, personalized nutrition source, influenced by maternal diet, lifestyle, and environmental factors, which shape its composition and impact infant health. This review synthesizes evidence on the associations between maternal lifestyles (e.g., diet, physical activity, smoking), breast milk composition, and child health, offering insights for interventions to optimize breastfeeding benefits.

We searched Web of Science, Medline, Embase, and PubMed for studies published up to March 2024 using predefined terms.

Out of 5244 articles, 20 studies met the inclusion criteria. Maternal Body Mass Index and macronutrient intake significantly affected breast milk fatty acid composition, influencing infant growth, cognitive development, and metabolic health. Micronutrient intake, particularly iodine, omega-3 fatty acids, and vitamins, was linked to better neurodevelopment and reduced atopic risks. Maternal diet and supplementation improved breast milk nutrient profiles and infant outcomes, though exposure to toxins like ochratoxin A raised concerns. Smoking was associated with altered milk composition, including lower osteopontin levels, potentially affecting infant immunity and growth.

This review emphasizes that adequate intake of key nutrients is essential for infant development, highlighting the need for policies that address nutritional deficiencies, promote healthy lifestyles, and reduce socio-economic barriers. These efforts can improve outcomes for both mothers and children, enhancing public health and reducing disparities.