Early peanut introduction in infants tied to sharp drop in food allergy diagnoses, CHOP study finds
A 2025 Children’s Hospital of Philadelphia study of more than 120,000 pediatric records found that early peanut introduction in infants was associated with notable declines in peanut and overall food allergy diagnoses across U.S. clinics, offering real-world support for 2017 guidance.
Key takeaways
- Large observational study: CHOP analyzed electronic health records from over 120,000 children across dozens of pediatric practices (CHOP press release).
- Major declines: Early peanut introduction was linked to a 27% reduction in peanut allergy diagnoses and about a 38% decline in overall food allergy diagnoses (Fox News coverage).
- Context and caution: The findings align with post-2017 guideline trends but are observational and cannot prove causation; the dataset ends in early 2019 (ACAAI).
Study details
What was done: The Children’s Hospital of Philadelphia (CHOP) team, led by Stanislaw Gabryszewski, M.D., Ph.D., performed an observational analysis of electronic medical records spanning more than 120,000 children from numerous pediatric practices to examine diagnosis trends after the 2017 National Institute of Allergy and Infectious Diseases guidance encouraging early peanut introduction (CHOP press release).
Why it matters: The team sought real-world evidence that the LEAP trial and subsequent guideline changes translated into population-level reductions in clinic-diagnosed food allergies.
What the data show
- Peanut allergy: Diagnoses fell by about 27% overall, with declines reaching up to 43% in some age groups as practice patterns shifted beginning around 2015 (Fox News).
- Overall food allergy: Clinic-diagnosed food allergies declined roughly 36–38%, largely driven by the drop in peanut allergy; eggs are now the most common food allergy among young children, followed by milk and wheat (ACAAI; National Peanut Board).
“Feeding peanuts to some high‑risk infants between 4 and 11 months cut their chance of developing a peanut allergy by about 81% in the LEAP trial,” a key rationale behind the guideline shift that CHOP examined in practice.
Why researchers re-examined peanut advice
For decades, parents were advised to delay introduction of peanuts and other common allergens. The LEAP randomized trial reversed that view for many high‑risk infants, showing marked protection when peanuts were introduced at 4–11 months—prompting the 2017 NIAID guidance for high‑risk babies and wider adoption in practice.
CHOP’s analysis was designed to detect whether those controlled-trial benefits were visible at scale in routine pediatric care.
Study limitations and expert caution
Observational design: Investigators and outside experts emphasize that the CHOP study links early peanut introduction with fewer diagnoses but cannot establish direct causation.
Other potential influences—changing feeding behaviors, clinic coding differences, socioeconomic shifts, or families avoiding care—could have affected diagnosis trends. In addition, the dataset ends in early 2019 and does not capture the broader 2021 guidance recommending early introduction of multiple allergens (Fox News).
Practical guidance for parents and pediatricians
Allergy organizations and researchers stress safe implementation. Key recommendations commonly advised include:
- Timing: Introduce peanut-containing foods around 4–6 months. Infants with severe eczema or egg allergy are higher risk and may need evaluation before introduction (ACAAI).
- Frequency and form: Offer small amounts roughly twice a week through toddlerhood. Avoid whole peanuts; use thinned smooth peanut butter or commercial peanut puffs made for infants (ACAAI; Lurie Children’s).
- Medical advice: Discuss plans with your pediatrician if an infant has severe eczema, known egg allergy, or other concerns; some high‑risk infants may need testing or supervised clinic feeding (Lurie Children’s).
Surveys show many parents remain confused about details such as timing, testing needs, and maintaining ongoing exposure, and training tools for pediatricians are being developed to boost guideline adherence (Lurie Children’s; Northwestern news).
Implications for Los Angeles, California
Local pediatric care: With LA’s large, diverse pediatric population, wider adoption of early peanut introduction could meaningfully reduce food allergy diagnoses; clinicians and community clinics may need ongoing training and support (training tools).
Health equity: Public-health efforts should ensure culturally appropriate education and access to care for underserved neighborhoods so high‑risk infants can receive evaluation and guidance (Lurie Children’s).
Childcare and school policy: A sustained decline in peanut allergy diagnoses could prompt review of peanut-restriction policies in childcare centers and school districts, but changes should be gradual and evidence‑based.
Nutrition programs: WIC and pediatric nutrition services can update materials to include safe methods for early peanut introduction (thinned smooth peanut butter, appropriate infant products) while emphasizing consultation for high‑risk infants (ACAAI; Lurie Children’s).
Family preparedness: LA parents should discuss early peanut introduction with pediatricians and learn safe feeding techniques and signs of allergic reactions; fewer children may become peanut-allergic, but clear guidance remains essential.
Ongoing questions researchers want answered
Investigators note further research is needed to confirm causation, to track trends after early 2019 and the 2021 multi‑allergen guidance, and to determine how long tolerance persists if exposure is interrupted. Experts urge continued monitoring and caution in attributing the full decline solely to early peanut introduction (commentary and critique).
Reporting and resources
- CHOP news release on the study
- Fox News summary of findings
- ACAAI overview and expert reaction
- National Peanut Board statement
- Parent guidance and confusion study at Lurie Children’s
- Commentary on limitations and alternate views
- Tools to boost pediatrician adherence to guidelines
- Related JAMA Network article on parental awareness and practices
For Los Angeles parents weighing peanut allergy prevention for their infants, pediatricians remain the first source of individualized advice; public‑health officials and clinicians in LA will monitor follow‑up data to guide safe, equitable practice.
