You can develop an allergy to a product after repeated exposure to it. An allergy can "crop up" at anytime during life. If you take Benedryl, or another antihistamine and you get relief, you can bet it is an allergy. Perhaps you consume a product that has recently undergone a "new and improved" label? This means it has been re-formulated and may be just now effecting you. If you suspect a particular product, remove it from your diet for at least 2 weeks, 3 is better then re-introduce it to see how it affects you. Dairy or wheat are the two most common food allergies. Since this method can take a long time to get one product at a time out of your diet/routine, you may wish to visit an allergist and get tested. good luck
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