Food Allergy Research

New Findings in Adult-onset Food Allergy

At least 15 percent of people with food allergies develop the condition after the age of 18, a new study suggests.


Our understanding of the prevalence and characteristics of food allergy have been based mostly on studies examining the condition in children. In contrast, this study, published in JACI: In Practice in August 2014, revealed new information about many aspects of adult-onset food allergy, including age of onset and most common allergic triggers.

Researchers from Chicago’s Northwestern University Feinberg School of Medicine reviewed medical records from a database of 1,111 patients who had been diagnosed with food allergy by physicians at Northwestern’s adult allergy clinics. They determined that 171 patients met criteria that included age at the time of diagnosis, medical history, test results, and international diagnosis codes. Based on an assessment of these patients, the researchers found that:

  • The age of first reaction peaked during the early 30s, with patients’ ages ranging from 18-86 years.
  • An older age at the time of diagnosis was associated with higher risk for severe reactions.
  • A higher percentage of the patients were female, which contrasts with the male dominance of food allergy in children.
  • The five most common food allergies among this group were shellfish, tree nuts, fish, soy and peanut. Study participants also identified 14 other foods as allergic triggers.
  • Approximately 16% of patients were allergic to more than one food.

Although the researchers state that additional studies are needed to provide “a more complete picture of this patient group,” they note that these findings support the importance of understanding food allergy in adults, “particularly in understanding that new-onset food allergy is evident across a broad age range during adulthood.”

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10 thoughts on “New Findings in Adult-onset Food Allergy

  1. Has there been a study on adult-onset allergies during pregnancy? I never had an allergy to sesame seeds until my second pregnancy, and my second child happened to have egg and dairy allergies. (My first child has no known food allergies.) It makes me wonder if something happened during the pregnancy to cause an allergy in both of us.

  2. This is what happened to me! I had to learn to cook egg-free when I turned 30. I just had someone ask me if developing a food allergy in adulthood is common the other day. -Tabitha Elliott, Author of The Egg-Free Cookbook (available on Amazon)

  3. Very interesting reading. I would have to say that I think that the stats on the number of those who are adults with food allergies is probably higher than stated. Also, I was diagnosed almost 3 years ago with my peanut allergy. I was 40 years old when I got that diagnosis.

  4. I wonder if my “suddenly severe life threatening allergies ” at the age of about 55 had anything to do with the radiation I had to eradicate my hyperactive thyroid?

  5. I think this has far more to do with all of the frankenstein food , gmo and pesticides being used on our food . Wonderful isnt it ? Cant forget the chemicals being sprayed in the air , this is crazy and unfair , were not put on this earth to be test rats .

  6. I was 31 when I noticed my stomach would swell up and hurt to the point I would have to go to the hospital for the pain, it happened Everytime I ate an egg, I didn’t want to believe it, I grew up on eggs, I love eggs, there’s eggs in every thing that’s good, I did it 3 times, ate eggs, inded up in the hospital, finally had a simple blood test done, sure enough not only was I allergic to eggs, I am allergic to peanuts, tomatoes and anything with egg in it, so yes you can become allergic to something after 30 years of eating it. Thanks for your help.

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