Suspected food allergies should always be evaluated, diagnosed, and treated by a qualified medical professional, such as a board certified allergist. Your primary care provider may refer you to an allergist.
Do not diagnose a food allergy on your own. Self-diagnosis can lead to unnecessary dietary restrictions and inadequate nutrition, especially in children. Additionally, some people think they are allergic to a food when they actually have another type of food disorder, and treatment may differ. Some methods of food allergy testing are unproven and are considered controversial, since no definitive studies have shown that they can effectively diagnose food allergies. Some may even increase the risk of an allergic reaction.
An allergist will first start to diagnose a food allergy is a thorough medical history. The allergist will ask questions to determine if food allergy may be causing your symptoms and to identify the culprit food(s), and will then perform a physical exam.
Next, the allergist may conduct tests to help identify a food allergy. While these tests alone do not always provide clear-cut answers, the allergist will combine your test results with the information given in your medical history to provide a diagnosis.
These are some testing ways to find out which food allergy a person has.
These tests are all proven diagnostic methods. Depending on your medical history and initial test results, you may have to take more than one test before receiving your diagnosis.
References
Diagnosis & Testing – Food Allergy Research & Education. (n.d.). Retrieved July 07, 2016, from http://www.foodallergy.org/diagnosis-and-testing
Food Allergies 
I enjoyed this post. Some people may think a certain type of food makes them ill or they say they are allergic to it when that is not the case. It is very important to be diagnosed from a profession about a food allergy.
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