Scientists Challenge Long-Held Beliefs About Peanut Allergies, Potential Breakthrough on the Horizon
London – Decades of advice to delay introducing allergenic foods like peanuts to infants may have inadvertently increased the prevalence of peanut allergies, according to emerging research challenging long-held medical assumptions. A new wave of studies, building on the landmark LEAP trial, suggests early introduction of these foods - even to babies with eczema – could be key to building tolerance and preventing the growth of life-threatening allergic reactions.
For years, pediatricians cautioned parents to postpone giving babies peanuts, fearing sensitization. However, this approach coincided with a dramatic rise in peanut allergies, affecting an estimated 2% of children in Western countries. Now, scientists are focusing on how food is introduced, not when, with a theory known as the ”dual-exposure hypothesis.” This research offers a potential path toward significantly reducing the burden of food allergies, which impact an estimated 32 million Americans, according to Food Allergy Research & Education (FARE).
The dual-exposure hypothesis, supported by decades of research including the LEAP trial, posits that exposure to food proteins thru the gut promotes tolerance, “teaching the immune system that these foods are safe,” explained Dr. George Hill to CNN. Conversely, exposure through compromised skin – common in infants with eczema – can trigger sensitization and increase allergy risk. “Early exposure to food proteins through the gut promotes tolerance, teaching the immune system that these foods are safe,” he told CNN.”In contrast, exposure through inflamed or disrupted skin - as frequently enough occurs in infants with eczema – can sensitize the immune system and increase the likelihood of developing food allergy.”
Researchers believe babies can encounter food proteins through the skin simply from their parents consuming those foods. dr. Lack illustrates the concept with an analogy: “If I were to knock on your front door and ask for directions, you’d probably greet me in a civil way. But if I were to break into one of the windows, you might greet me in a different way.”
The ongoing SEAL study (NCT03742414) is actively investigating this theory. The trial focuses on treating dry or red, flaky skin in the first 12 weeks of life with moisturizers and topical steroids, while simultaneously encouraging early food consumption. The goal is to determine if proactively addressing skin barrier dysfunction and increasing early oral exposure can reduce the likelihood of developing food allergies.
If accomplished, this shift in understanding could revolutionize allergy prevention and treatment, offering hope for a future with fewer children living with the constant threat of anaphylaxis.
