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Even as the prevalence of childhood peanut and tree nut (P/TN) allergies rises, recent guidelines do not offer clear advice on whether introducing these allergens early in life or prenatally affects risk for such allergies (either positively or negatively). Researchers examined reported diet from women in the Nurses' Health Study II as well as later reports of food allergies in 8205 of their children. Dietary history determined P/TN intake within 1 year of pregnancy in 76% of mothers, and serial surveys showed that maternal P/TN consumption was generally stable regardless of pregnancy. Medical records were reviewed to confirm the children's allergy diagnoses and symptoms; 140 cases of P/TN allergy were identified.
Analysis adjusted for confo…