Parents were once advised to keep allergenic foods, including eggs, away from babies, particularly if allergies were common in the family. Yet recent findings suggest that this guidance has flipped almost completely—new research indicates that this shift might be having positive effects.
After recommendations changed from delaying allergenic food introductions until babies were one to three years old to suggesting it should happen around six months, a study recently published in JAMA Pediatrics found that egg allergy prevalence in children fell by over 17%.
Jennifer Koplin, a lead author from the University of Queensland’s Child Health Research Centre, remarked via email that these results demonstrate how guideline changes grounded in solid evidence can significantly lower food allergy rates.
Conducted in Australia, the study complements the growing evidence that new feeding guidelines are not just safe but also linked to meaningful declines in egg allergies among children, hopefully easing some concerns for parents unsure about introducing allergenic foods.
Koplin pointed out that, to her knowledge, this is the first study to show a population-level drop in egg allergies connected to newly recommended infant feeding guidelines.
In the U.S., the recommendations for preventing food allergies in children have undergone significant changes over the last few decades, leading many parents to wonder which advice to trust and if the latest recommendations are genuinely safe.
Back in 2000, the American Academy of Pediatrics had suggested that infants at high risk for allergies—those with eczema or a family history of allergies—should avoid eggs until they reached age two. The reasoning was that waiting might prevent allergic reactions.
However, as more research surfaced, that guidance began to evolve. By 2008, the AAP revised its recommendations to support introducing eggs around six months, noting that there was little evidence to suggest that delaying exposure actually prevented allergies.
Research increasingly suggested that early egg introduction might lower the risk of developing an egg allergy.
Allergy prevention guidelines across the globe have also been updated, with Australia modifying its infant feeding guidelines in 2016 to recommend introducing eggs and other food allergens in the first year of life to help mitigate food allergies, as noted in the new study.
Such shifts in medical guidance aren’t uncommon, but Dr. Aaron Carroll and Dr. Ron Keren remarked in an editorial accompanying the study that this case serves as a reminder that initial misjudgments could have been avoided.
They expressed that the recommendations made were premature and that families faced the repercussions of following outdated advice, emphasizing the need for transparency in issuing medical guidelines.
The study’s findings resonate with recent research showing that similar changes in peanut allergy recommendations have also led to reductions in child peanut allergy rates. Last year, a separate study published in Pediatrics confirmed that revised guidelines had a positive impact on peanut allergy prevalence.
This latest study analyzed data from over 7,000 infants aged 11 to 15 months during immunization visits in Melbourne, Australia. These infants were divided into two groups: those who had visits between 2007 and 2011, before the guideline updates, and those between 2018 and 2019, after the updates.
For both groups, parents filled out questionnaires, and infants underwent testing for egg allergies. The researchers examined the age when eggs were introduced and the number of children diagnosed with an egg allergy.
Koplin noted that they aimed to observe a decline in allergies following the implementation of the 2016 guidelines. Initially uncertain about parental compliance with these recommendations or its potential outcomes, the results encouraged them, showing clear trends in reduced egg allergies associated with parental adherence.
Data revealed that the rate of infants introduced to eggs by six months increased significantly, from about 25% in the earlier group to approximately 57% in the later one.
Furthermore, the incidence of egg allergy among the first group, before the guidance revision, was 9.2%, which fell to 7.6% in the later group, reflecting a relative decrease of about 17.7%.
For infants with early eczema, the prevalence of egg allergy dropped from 34.6% to 21.9%, supporting the overall positive trend.
Sung Poblete, the CEO of Food Allergy Research & Education, expressed excitement over the population-level evidence confirming the benefits of early allergen introduction.
Poblete noted that the widespread adoption of early allergenic food introduction aligns with significant public health benefits regarding egg allergy prevention.
While this study took place in Australia, its insights could offer relevant perspectives for U.S. practices. Koplin remarked on the similar guidance in the U.S., suggesting that the U.S. might see corresponding reductions in egg allergy rates.
However, it is important to note that U.S. statistics revealed relatively low rates of timely egg introduction, at just 15.5% of infants before seven months in 2021, compared to the 57% in the study’s latter group.
Egg allergy is notably prevalent among children, affecting about 1.3% of those under five in the U.S., but many eventually outgrow it, with reduced prevalence into adulthood.
Egg allergy occurs when the immune system overreacts to proteins found in egg whites or yolks, which can trigger serious allergic symptoms, including hives and respiratory issues, or even anaphylaxis.
Dr. Scott Sicherer highlighted the importance of early exposure to reduce allergy risks, explaining how the immune system learns to accept foods when they’re introduced appropriately.
If the immune system is not adequately exposed to specific foods, it may misinterpret them as threats, particularly in infants with eczema who have compromised skin barriers, leading to incorrect immune responses.
The study illustrates how updated feeding guidelines can yield real-world benefits, according to Dr. Elizabeth Lippner, an allergy and immunology physician who commented on the findings.
Lippner expressed hope that similar trends will emerge in the U.S., reflecting observable shifts in her clinics regarding adherence to current recommendations.
While early introduction of allergens is key, it’s vital that parents ensure their children are developmentally ready for solid foods, monitoring for any potential allergy symptoms and consulting with pediatricians about appropriate food introduction methods.
In terms of readiness, recommendations suggest infants should be able to sit independently or with support, control their head and neck, and show cues of readiness for swallowing before introducing solids.
Infants typically handle grains, fruits, and vegetables before allergenic foods, but once they manage solids like pureed foods, proteins like egg or peanut can be gradually included with adequate preparation.
