Early Peanut Introduction Linked to Significant Drop in Childhood Food Allergies
A new study reveals that updated guidelines recommending early peanut introduction are associated with a marked decline in both peanut and overall food allergies among young children in the United States.
New evidence published in the journal Pediatrics demonstrates a significant association between public health recommendations issued in 2015 and 2017 – specifically those advocating for the early introduction of peanuts in infant diets – and a decrease in real-world rates of food allergies. Researchers analyzed electronic health record data from tens of thousands of U.S. children, comparing allergy diagnoses before and after the guidelines were implemented.
Historically, pediatricians advised parents to delay introducing common allergens, like peanuts, to children, particularly those at high risk for conditions like atopic dermatitis (AD). This approach stemmed from a belief that avoidance would prevent the development of allergies. However, over the past two decades, mounting evidence challenged this long-held advice, finding that avoidance was often ineffective. The landmark 2015 Learning Early About Peanut Allergy (LEAP) trial was pivotal in shifting this paradigm, demonstrating that early and sustained peanut consumption in high-risk infants aged 4-11 months dramatically reduced their risk of developing a peanut allergy – by as much as 81%.
Following the LEAP trial, several health organizations issued new guidelines encouraging early allergen introduction. However, until now, the real-world impact of these guidelines remained largely unverified. “Establishing the benefits of early peanut introduction may help hasten their adoption, improving outcomes and quality of life for millions of children,” researchers stated.
The current study addressed this knowledge gap by leveraging data from the American Academy of Pediatrics Comparative Effectiveness Research through Collaborative Electronic Reporting (CER²), a large network of pediatric primary care practices. The analysis focused on children between the ages of zero and three, dividing them into three cohorts based on when they entered the medical system: a pre-guidelines cohort (September 2012 – August 2014), a post-guidelines cohort (September 2015 – August 2017), and a post-addendum guidelines cohort (February 2017 – January 2019). Researchers then compared the cumulative incidence of immunoglobulin E-mediated food allergy (IgE-FA) – the most common type of food allergy – across these groups.
The findings revealed a significant association between the publication of the guidelines and a reduction in IgE-FA-associated food allergies. Comparing the pre-guidelines cohort to the post-addendum guidelines cohort, the incidence of peanut IgE-FA declined from 0.79% to 0.45%, representing a roughly 45% reduction in diagnosis risk (Hazard Ratio [HR] 0.55, p < 0.0001). Importantly, the positive effects extended beyond peanuts; the overall incidence of any IgE-mediated food allergy fell from 1.46% to 0.93%, equating to a 37% reduction in risk (HR 0.63, p < 0.0001).
However, the study also revealed some nuanced results. Children with pre-existing atopic dermatitis did not experience a significant reduction in peanut allergy risk. Furthermore, while cow’s milk allergy diagnoses decreased, egg allergies did not follow suit. In fact, egg allergy surpassed peanut allergy as the most commonly documented food allergen in the post-guideline periods.
Researchers also observed a significant increase in the diagnosis of atopic dermatitis during the study period (p < 0.0001), potentially reflecting earlier identification of at-risk infants by pediatricians. Demographic shifts were also noted, with decreased representation of Black, Asian/Pacific Islander, and Hispanic children among those diagnosed with food allergies after the guidelines were implemented. .
The interrupted time series analysis confirmed a significant decline in any food allergy diagnosis, though it did not reach statistical significance specifically for peanut allergy.
This study provides robust, real-world evidence suggesting that the national shift in pediatric food allergy advice may be yielding positive public health benefits. While the reductions observed were more modest than the 81% decrease seen in the controlled LEAP trial, researchers emphasize that these findings support the guidelines as a valuable step toward healthier, allergy-free childhoods. They also suggest a need to strengthen real-world implementation efforts. The study period concluded before the potential impacts of the 2021 guidelines could be assessed, leaving room for further investigation.
Journal reference: Gabryszewski, S. J., Dudley, J., Faerber, J. A., Grundmeier, R. W., Fiks, A. G., Spergel, J. M., & Hill, D. A. (2025). Guidelines for Early Food Introduction and Patterns of Food Allergy. Pediatrics. DOI – 10.1542/peds.2024-070516. https://publications.aap.org/pediatrics/article/doi/10.1542/peds.2024-070516/204636/Guidelines-for-Early-Food-Introduction-and
