Peer-reviewed article
Early-Life Nutrition: The Interplay of Nutritional, Microbial, Genetic, and Environmental Factors in Food Allergy Development and Prevention.
Rogalidou M, Siahanidou T ·
Summary
Written by AI, not yet AICS's view · claude-haiku-4-5-20251001This review examines how early nutrition affects food allergy development in infants and young children. It finds that early introduction of allergenic foods like peanuts and eggs during feeding may help prevent allergies. The study shows that food allergy results from complex interactions between diet, gut bacteria, genes, and environmental factors rather than single causes. Other approaches like avoiding allergens during pregnancy, special formulas, and probiotics lack sufficient evidence for prevention.
Key points
- Timely introduction and continued ingestion of allergenic foods, particularly peanut and egg, during complementary feeding has the most consistent evidence for primary prevention
- Early life is a critical window for immune maturation and establishment of oral tolerance
- Nutritional exposures interact with gut microbiome, epithelial integrity, and immune pathways
- Evidence is insufficient or inconsistent for maternal allergen avoidance, hydrolyzed formulas, probiotics, and skin-barrier strategies as preventive approaches
- Food allergy involves complex interactions among diet, microbiota, epithelial barriers, host genetic susceptibility, and environmental exposures
Limitations
This is a literature review synthesizing existing evidence rather than conducting new research, so it depends on the quality and completeness of published studies. The review notes that many areas show inconsistent or insufficient evidence, limiting what can be concluded about alternative prevention strategies.
Abstract
Background Food allergy is an important health concern, particularly during infancy and early childhood. Its development reflects complex interactions between genetic susceptibility and early-life nutritional, microbial, epithelial, immunological, and environmental factors. Objective To examine the role of early-life nutrition in the development and prevention of food allergy, with emphasis on its interplay with the gut microbiome, genetic and epigenetic susceptibility, epithelial barrier function, and environmental exposures. Methods A structured literature search was conducted primarily in PubMed, supplemented by relevant articles identified through additional bibliographic databases and literature sources. Evidence was thematically synthesized across maternal nutrition, breastfeeding, complementary feeding, allergenic food introduction, dietary diversity, micronutrients, fatty acids, gut microbiome development, genetic and epigenetic mechanisms, and environmental exposures. Results Early life represents a critical window for immune maturation and the establishment of oral tolerance. Nutritional exposures interact with the gut microbiome, epithelial integrity, and immune pathways, potentially influencing tolerance and sensitization. The most consistent evidence for primary prevention supports the timely introduction and continued ingestion of allergenic foods, particularly peanut and egg, during complementary feeding. Evidence remains insufficient or inconsistent to support maternal allergen avoidance, targeted supplementation, hydrolyzed formulas, probiotics, microbiome-directed interventions, or skin-barrier strategies as established preventive approaches. Associations involving microbiome composition, medication exposure, pollution, and other environmental factors remain heterogeneous and are largely observational. Conclusions Food allergy reflects complex interactions among diet, microbiota, epithelial barriers, host susceptibility, and environmental exposures rather than a single causal factor.