Pre- and probiotics for allergy prevention: time to revisit recommendations?

Area of Science:

• Immunology
• Microbiology
• Allergy Research

Background:

• Reduced microbial exposure affects immune maturation, increasing allergy prevalence.
• Gut microbiota composition in early life is linked to allergy development.
• Modern societal 'dysbiotic drift' necessitates interventions to restore microbial balance.

Purpose of the Study:

• To review randomized controlled trials of gut microbiota modulation for allergy prevention.
• To discuss expert recommendations on prebiotic, probiotic, and synbiotic interventions.
• To identify factors influencing the efficacy of these interventions and propose improvements.

Main Methods:

• Systematic review of randomized placebo-controlled trials.
• Analysis of international expert body guidelines (e.g., World Allergy Organization).
• Discussion of factors like probiotic strain, timing, and duration of administration.

Main Results:

• World Allergy Organization conditionally recommends probiotics for primary allergy prevention in high-risk infants and mothers.
• Evidence supporting these recommendations is of very low quality.
• Significant heterogeneity exists between studies, limiting specific advice.

Conclusions:

• Probiotic use for allergy prevention has potential but requires more high-quality evidence.
• Optimizing probiotic strain selection, administration timing, and duration is crucial for immune modulation.
• Further research is needed to develop evidence-based, effective allergy prevention strategies.