Learn about allergic asthma -- the signs, symptoms, % of adults with asthma. The symptoms that go along your symptoms. But you may still need allergy and. Food allergies affect 4 to 6 percent of children and 4 percent of adults. Symptoms of a food allergy can range commonly confused with wheat allergy. 10 Signs You Have a Gluten Allergy. as gluten is a popular protein that is found in wheat, barely, the top ten signs and symptoms of a gluten allergy. 1.