A study recently published in the Annals of Allergy, Asthma and Immunology shows that half of patients who test positive for tree nut allergies based on blood or skin prick assessments experience no reaction to the nuts when consumed. Tree nuts, such as cashew nuts, Brazil nuts, hazelnuts and walnuts are among the eight most common food allergies in children and adults. Based on the findings, the researchers suggest that individuals with an allergy to a single tree nut should undergo an oral food challenge in order to confirm allergies to other tree nuts.  Written by Honor Whitman Published Today