Factors influencing age of common allergen introduction in early childhood

Area of Science:

• Pediatric Allergy and Immunology
• Public Health
• Nutritional Science

Background:

• The timing of introducing common allergens, such as peanuts and eggs, to infants is a critical factor in preventing food allergies.
• Recent guideline changes in the U.S. have aimed to standardize and potentially advance the age of allergen introduction.
• Understanding the factors influencing these introduction timings is crucial for public health initiatives and clinical practice.

Purpose of the Study:

• To evaluate factors influencing the timing of allergen introduction in U.S. infants.
• To assess the impact of updated National Institute of Allergy and Infectious Diseases (NIAID) peanut introduction guidelines on infant allergen exposure.
• To identify potential disparities in allergen introduction based on race and birth order.

Main Methods:

• Prospective observational cohort study (Gastrointestinal Microbiome and Allergic Proctocolitis - GMAP study) in suburban Massachusetts.
• Caregiver-reported data on allergen introduction timing for infants enrolled between 2014 and 2017.
• Multivariable linear and survival regression analyses to examine influencing factors.

Main Results:

• Infants eligible under the 2017 NIAID guidelines were more likely to be introduced to peanut by 9 months (54% vs. 42%).
• Significant racial disparities were observed: Black and Asian children were less likely to be introduced to peanut and egg early compared to White children.
• First-born children were more likely to be introduced to peanuts earlier than subsequent children.

Conclusions:

• Updated guidelines, race, and birth order significantly influenced the timing of peanut introduction.
• Racial disparities in allergen introduction timing warrant further investigation to address potential inequities.
• Further research is needed to evaluate current allergen introduction practices and identify strategies to mitigate disparities.