The most common food allergens are peanuts, tree nuts, fish, shellfish, milk, eggs, wheat, and soy.

Symptoms of a food allergy can include itching or tingling in the mouth, hives, eczema, itching or tingling in the throat, wheezing, difficulty breathing, stomach pain, diarrhea, nausea, and a drop in blood pressure. In severe cases, an allergic reaction can lead to anaphylaxis, a potentially life-threatening condition.

A food allergy is usually diagnosed through a combination of a medical history, physical examination, and allergy testing, such as skin prick tests or blood tests.

The primary treatment for a food allergy is strict avoidance of the allergen, and it's important to have emergency treatment plans and an epinephrine auto-injector. There are new treatments and therapies under development and some allergy centers are conducting desensitizations. 

It is possible for some people to outgrow certain food allergies, particularly those that develop in childhood. For example, children with milk, egg, soy, and wheat allergies are more likely to outgrow these allergies as they grow older. However, it's not as common for individuals to outgrow allergies to peanuts, tree nuts, fish, and shellfish, as these allergies tend to be more persistent and are more likely to be lifelong.

It's also important to note that even if someone has outgrown a food allergy, it does not mean that they will never have a reaction again, as some people may still have a reaction to the food even after they have outgrown the allergy. In such cases, it is important to continue monitoring their reactions to the food and be prepared for any emergency situations.

It's best to consult an allergist, who can conduct tests and evaluate your medical history to give you a better understanding of your allergies, and the possible potential of outgrowing it.

Be sure to inform your server about your food allergies, and ask about the ingredients in dishes and how they are prepared. You may also want to speak with the chef or manager to ensure that appropriate precautions are taken to prevent cross-contamination.

Currently, there is no known way to definitively prevent the development of food allergies. But, recent research has found that exposing children to a diverse range of foods early in life can lead to a decreased risk of allergic disease later in life. A study published in the New England Journal of Medicine found that dietary peanut introduction during infancy reduced the risk of developing a peanut allergy by 81%. These findings suggest that early and consistent exposure to a food, particularly one that is commonly associated with allergies like peanuts, may help prevent the development of an allergy to that food. That said, once a patient has a known food allergy, the best prevention method is avoidance. It is possible to perform allergy tolerance or food challenge tests later on to determine if the allergy still remains. 

It's important to remember that everyone's experience with food allergies can be different and that it's always recommended that you talk to a medical professional regarding management of your food allergy. It's also wise to have an emergency action plan, especially if you have a severe reaction to a certain food.