It is possible to outgrow a food allergy, especially for young children, but you should always seek medical advice before reintroducing foods into your diet. Broadly speaking around 80% of children outgrow allergies to cow’s milk, egg, soy and wheat but allergies to tree nuts, fish or shellfish tend to continue into adulthood. Research has shown that children who experience severe reactions are also less likely to outgrow an allergy and the earlier in life a food allergy is experienced, the more likely you are to outgrow it. Unfortunately if you develop a food allergy as an adult, you are much less likely to outgrow it.