“But until recently, there was nothing to do about food allergies except avoid that food.” Inside an Allergy Test“An allergic reaction is when a person’s immune system identifies a harmless substance as dangerous,” explains Dr. Natalie. Any food allergy that has been shown to cause the production of IgE can be treated with OIT. In the US, the nonprofit Food Allergy Support Team maintains a searchable map of OIT clinics at fastoit.org. For readers seeking additional information about allergies or OIT, Tova can be contacted via Family First.