They also found that about half of the adults developed one of thier food allergies as an adult. It was most common for those to develop allergies to shellfish as an adult. "The study data indicate that the most prevalent food allergens among U.S. adults are shellfish (affecting 7.2 million adults), milk (4.7 million), peanut (4.5 million), tree nut (3 million), fin fish (2.2 million), egg (2 million), wheat (2 million), soy (1.5 million), and sesame (.5 million)."
Children's Hospital of Chicago
https://www.luriechildrens.org/en/news-stories/one-in-10-adults-in-u.s.-has-food-allergy-but-nearly-one-in-five-think-they-do/
One in 10 Adults in U.S. Has Food Allergy, but Nearly One in Five Think They Do
January 4, 2019