PURPOSE OF THE STUDY.
To identify factors associated with peanut sensitization.
The study population included 512 infants aged 3 to 15 months with likely milk or egg allergy but no previous diagnosis of peanut allergy.
Enrollment criteria included history of immediate allergic reactions to cow's milk (and/or egg) and a positive skin-prick-test (SPT) result to milk (or egg if the clinical reaction was to egg) and/or moderate-to-severe atopic dermatitis and a positive SPT result to milk or egg. This longitudinal study was aimed at observing the development of peanut allergy; therefore, children with a known peanut allergy or known peanut-specific immunoglobulin E (IgE) level of ≥5 kU of antibody (kUA)/L before enrollment were excluded. Maternal ingestion of peanut was queried retrospectively. In categorical analyses, frequent maternal peanut ingestion was defined as ≥2 times per week. A peanut-IgE level of ≥5 kUA/L was used as the end point to signify a high likelihood of peanut allergy.
The 503 participants from whom blood samples were obtained were included. At enrollment, 140 (27.8%) of the participants were found to have a peanut-IgE level of ≥5 kUA/L. A peanut-IgE level of ≥5 kUA/L was associated with sensitization to egg or milk, male gender, nonwhite race, and frequent maternal peanut consumption during pregnancy. There was a dose-dependent association between frequent maternal peanut ingestion during pregnancy or breastfeeding and a peanut-IgE level of ≥5 kUA/L, but only consumption during pregnancy was a significant predictor. Of the 71 infants who were never breastfed, frequent peanut consumption during pregnancy was related to a peanut-IgE level of ≥5 kUA/L.
Maternal ingestion of peanut during pregnancy was strongly associated with peanut sensitization in infancy.
Dietary advice for mothers during pregnancy and lactation is controversial because of conflicting results from previously published retrospective studies. This observational investigation of young atopic infants provides evidence that frequent consumption of peanut (≥2 times per week) during pregnancy is related to peanut sensitization; however, the development of clinical peanut allergy was not determined. The American Academy of Pediatrics (AAP) previously recommended peanut avoidance for pregnant and lactating women; however, the lack of scientific evidence to support such recommendations led to their withdrawal of that recommendation in 2008. Currently, neither the AAP nor the National Institute of Allergy and Infectious Diseases (NIAID) expert panel recommends maternal dietary avoidance of any foods, including peanut. The development of clinical peanut allergy among this study's cohort, as well as results of prospective investigations, will need to be examined before more definitive maternal dietary recommendations can be made.
- Copyright © 2011 by the American Academy of Pediatrics