Medscape - Childhood Allergies Increase Despite Early Exposure

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Child Food Allergies Rise Despite Early Allergen Exposure
Diana Swift
October 30, 2026

Self- or caregiver-reported pediatric food allergies continue to increase in the US and have not dropped significantly since 2011 despite early allergenic food introduction, a population-based review and meta-analysis found.

This finding warrants continued evaluation and intervention, according to Katherine Caid, MD, and Corinne Keet, MD, PhD, of the Division of Allergy and Immunology in the Department of Pediatrics at the University of North Carolina School of Medicine in Chapel Hill, writing in Annals of Allergy, Asthma & Immunology.

"Our hypothesis was that food allergy prevalence was likely increasing or unchanged," Caid told Medscape Medical News. "The early introduction food guidelines did not begin changing until 2015, and it often takes several years for new guidelines to be widely implemented. Given that context, we did not anticipate seeing a decrease at this time."

Their hypothesis was confirmed, based largely on data from the National Health Interview Survey. The meta-analysis found that from 2012 to 2018, food allergy prevalence increased at a rate of 1.6 percentage points (95% CI, 0.5-2.7) per decade in the overall population.

Article Key Points
Pediatric food allergy prevalence ↑ 5.6%→6.6% from 2012-2018.
Overall trend: +1.6 percentage points/decade; no major decline after early-introduction guidance.
10-17-year-olds had greatest increase; younger children largely unchanged.
Trends did not differ by race/ethnicity; prevalence stabilized 2021-2024.
Self-report may overestimate allergy; non-IgE intolerance and mislabeling likely contribute.
Dive Deeper
Which factors limit early allergen guideline implementation?
How do self-report and IgE-confirmed prevalence differ?
What predicts food allergy persistence into adolescence?
See clinical implications for practice
Summarize this article in patient-friendly language
The researchers had previously found a significant increase in self-reported food allergy among US children from the 1990s to the early 2010s, rising by 1.2% per decade from 1997 to 2011.

There has been a growing emphasis on allergy prevention with the shift to early introduction; early peanut introduction guidelines were released in 2015. While early introduction of allergenic foods has since proven helpful in preventing food allergy, it was unknown if population trends reflected this.

To fill that knowledge gap, the investigators undertook this review and meta-analysis of temporal trends in self-reported child food allergy and included a look at the effects of age and race or ethnicity on the estimated prevalence.

Overall, food allergy prevalence has continued to increase, though it stabilized between 2021 and 2024. "It was not surprising to find prevalence increased in the pediatric population overall and had not decreased among 0- to 4-year-old children as of 2018," said coauthor Keet. "This was expected due to the proximity of the assessment to the guideline changes in 2015."

The authors noted that two studies published in 2020 showed that in 2018 only 29% of general pediatricians and 65% of allergists had fully implemented the guidelines regarding early introduction. "Therefore, additional time and data collection would be needed to better assess and see potential reductions in food allergy prevalence," Keet said.

Some self-reported food allergy may have been non-immunoglobulin E (non-IgE)-mediated food intolerance instead, with self-reported data inflating the estimate. "It's common for any uncomfortable symptom that occurs following food consumption to be considered and possibly labeled as a food allergy," said Caid. The overlap between gastrointestinal symptoms in food allergies and those in intolerances can make this particularly confusing for patients and increase the false labeling of intolerances as allergies.

The Study

The study reviewed data from the National Health Interview Survey, administered nine times since 2011. Meta-regression and meta-analyses were performed for overall food allergy prevalence stratified by age and race, focusing on the 2012-2018 timeframe. Exploratory analyses were conducted with 2021 and 2024 data.

Food allergy increased from 5.6% in 2012 to 6.6% in 2018, for a 1.6-percentage-point (95% CI, 0.5-2.7) increase per decade, with stabilization between 2021 (7.9%) and 2024 (7.2%). Prevalence increased most among 10- to 17-year-olds, for a 3-percentage-point (95% CI, 1.7%-4.9%) increase per decade but was largely unchanged in younger children. Temporal trends did not differ by race or ethnicity.

Offering his perspective on the study, but not involved in it, Stanislaw J. Gabryszewski, MD, PhD, an attending physician in the Division of Allergy and Immunology at the Children's Hospital of Philadelphia, Philadelphia, said the findings align with the reality that pediatric allergists continue to care for many children with food allergies. "While it's unfortunate that food allergy remains a relatively common condition, I would be cautious about interpreting this study as evidence that prevention efforts are not working," he told Medscape Medical News.

He noted that in a recent multistate, electronic health records study, his group followed children aged 0-3 years before and after the publication of the 2015 expert guideline and 2017 addendum on early food introduction, with an observation period extending into 2020. The study used clinician-entered identifiers focusing specifically on IgE-mediated food allergy, the most common and serious form of food allergy and the type targeted by early introduction.

"While the continued high prevalence of food allergy across pediatric age groups is an important finding, this national survey may not have been optimally designed to detect early prevention-related signals among infants and toddlers over a sufficiently long period," he said.

As the allergy landscape evolves, clinicians and families will become better at recognizing different food allergies and distinguishing them from other reactions, and new studies will help us better understand and track these trends.

If early introduction prevents new food allergies, Gabryszewski added, the benefit should clearly appear in young infants, whereas national prevalence also includes older children who developed food allergy years earlier. "This study measured caregiver-reported food allergy rather than new, clinically documented IgE-mediated, anaphylactic food allergy, and it could not adequately examine whether peanut allergy specifically was changing."

Worth noting also is that early introduction recommendations have not been implemented consistently in clinical practice, reflecting ongoing practical barriers for families and clinicians. The intended benefits may emerge in selected populations or health systems before they become visible nationally.

"Early introduction remains an evidence-based approach, and the absence of a clear national decline gives us even more reason to continue to address implementation barriers," he said. "As younger birth cohorts age and additional data become available, time will tell whether changes begin to emerge in national self-reported patterns."

The authors agreed that future research should clarify whether the observed increase in food allergy prevalence is reflected by objective measurements such as skin prick testing or serum IgE levels. Serum IgE level responses to ingestion of milk, egg, peanut, and shrimp were previously evaluated in the National Health and Nutrition Examination Survey (NHANES) during 1988-1994 and 2005-2006.

"There were no significant changes seen in the prevalence of milk, egg, or peanut sensitization (IgE ≥ 0.35 kU/L), but shrimp sensitization decreased," said Keet. It has been 20 years since this assessment. The upcoming 2025-2026 cycle of NHANES will include serum IgE level reactions to foods, which will provide important objective measurement information.