When someone is allergic to nuts, their immune system mistakenly identifies nuts as a harmful substance. The immune system reacts to these substances or allergens. The first time someone is exposed to a nut allergen, they usually don’t have any symptoms. Their immune system, however, has recognized the allergen as a threat and gets ready to fight the allergen the next time it enters the body. When the allergen enters the body again, the immune system launches an attack by releasing chemicals such as histamine. The release of histamine is what causes allergy symptoms.
Although peanuts have the word nut in their name, they aren’t nuts. Peanuts are legumes and, unlike tree nuts, grow underground. Although peanuts are not tree nuts, people with a peanut allergy have a similar allergic reaction as those with a tree nut allergy.
If you have one tree nut allergy, it’s highly likely that you’re allergic to other tree nuts as well. However, only about 25 to 40 percent of people are allergic to both peanuts and tree nuts, according to Food Allergy Research & Education (FARE).
So that means you need to eliminate all tree nuts and/or peanuts from your diet.