Certain allergens such as cow’s milk and hen’s egg are universally common, and others such as peanut are increasing in many parts of the world. Other common food allergens in children are wheat, soya, fish and tree nuts. Some parts of the world have a higher rate of other more unusual allergies- such as mustard allergy in France and sesame seed allergy in Israel.
Adults have a slightly different list of most common allergies, as many have outgrown milk, egg or wheat allergies. In adults, nut and seafood allergies are the most common offenders. Certain fruits or vegetables may also start causing issues in older children or adults who have previously suffered from a pollen allergy- this is called the oral-allergy syndrome (also known as the pollen-fruit syndrome).