#5-11E. Redefining the Window of Opportunity: Early Intervention in Peanut Allergy (NEJM, 2026)

When is the optimal time to introduce allergenic foods to infants to prevent severe hypersensitivity? This review addresses this critical question by highlighting that early dietary introduction of peanut protein can reduce allergy prevalence by approximately 80%. Evidence indicates that ingesting 2 grams of peanut protein weekly for low-risk infants, and 4 to 6 grams for high-risk infants, is highly preventative. Furthermore, initiating oral immunotherapy early, between 1 and 3 years of age, yields significantly superior clinical remission rates compared to interventions in older children. The most pivotal takeaway is that the "window of opportunity" for prevention is exceptionally narrow; delaying introduction progressively escalates the risk of sensitization, especially in non-White infants or those with severe atopic dermatitis. However, when critically appraising the current therapeutic landscape, it is crucial to recognize that existing immunotherapies do not offer a permanent cure, as clinical tolerance frequently wanes within a year after treatment cessation. For clinicians, these findings underscore an urgent need to update daily weaning guidance, strongly advocating for early peanut introduction across all infant demographics to fundamentally alter the trajectory of this persistent allergy.

Citation: Du Toit G, Lack G. Prevention and Treatment of Peanut Allergy. New England Journal of Medicine. 2026. DOI: 10.1056/NEJMcp2314424

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