The prevalence of cereal allergy is highly influenced by geographical area and consumption habits. According to data from Alergologica 2015 [1], accounts for 2.1% all cases food in Spain. Beer a barley-based alcoholic beverage that also contains hops, yeast, other cereals (wheat, oats, corn, even rye). Barley the basis malt vinegar, whiskey, gin. Several allergens barley have been described, in...