In a study published in Clinical and Experimental Allergy, allergic sensitivity to tree nuts was common in Swedish adults, but most people never experienced symptoms.
In the study of 2,215 individuals, eczema, asthma, and egg allergies at an early age were associated with developing a tree nut allergy by adulthood. Also, allergen molecules were better diagnostic tools for predicting allergic symptoms to tree nuts compared with analyzing allergen extracts.
Tree nuts include hazelnuts, walnuts, pecans, cashews, pistachios, almonds, and brazil nuts.
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