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One recent study found that nearly 11% of adults experience food allergies. Half of those adults reported developing the allergies after age 18, according to the study published by the Journal of the American Medical Association (JAMA).

An adult-onset allergy can occur out of the blue and anywhere from minutes to hours after consuming a food, according to ABC News chief medical correspondent Dr. Jennifer Ashton.

\"As so many adults are experiencing this, the adults and the people around them do need to be able to recognize the symptoms,\" she said Thursday on \"Good Morning America.\"

Symptoms of an allergy attack can include everything from skin irritations like hives or eye swelling to digestive issues like nausea or vomiting to fainting and life-threatening or deadly anaphylaxis, according to Ashton.

A person who suffers from an allergy attack needs to see an allergist to get formally tested, according to Ashton. Once a person is diagnosed with an allergy, they must carry an epinephrine auto-injector with them at all times, she noted.

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