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In children, the foods that most commonly cause an allergic reaction are milk, eggs, peanuts, tree nuts, such as walnuts, brazil nuts, almonds and hazelnuts, fish and shellfish, such as crab, lobster and prawns.

Most children that have a food allergy will have experienced eczema during infancy. The worse the child’s eczema and the earlier it started, the more likely they are to have a food allergy.

In adults, the foods that most commonly cause an allergic reaction are peanuts, tree nuts, fruits, such as apples and peaches, fish, shellfish. 

It’s still unknown why people develop allergies to food, although they often have other allergic conditions, such as asthma, hay fever and eczema.

Most children who have food allergies to milk, eggs, soya and wheat in early life will grow out of it by the time they start school.

Peanut and tree nut allergies are usually more persistent. An estimated four out of five children with peanut allergies remain allergic to peanuts for the rest of their lives.

Food allergies that develop during adulthood, or persist into adulthood, are likely to be lifelong allergies.

Source: NHS