Food allergy is an increasing problem in our society. The incidence is estimated at 5-8% in children and 2-3% in adults. Peanut allergy for example has an estimated incidence of 0.5%. Food allergy is part of the atopy syndrome. Together with atopic dermatitis, it is the first manifestation of atopy in young children. The most important food allergens in infancy are cow’s milk, peanut, nuts and hen’s egg. In adults, these are peanut, nuts, and fruit. Food allergy can lead to mild, moderate or even severe symptoms. Especially when peanut or other nuts are involved, severe anaphylactic reactions may occur.