http://www.wrightslaw.com/blog/?p=58
The Office of Civil Rights, a division of the Department of Justice, has ruled that a history of anaphylaxis is a disability for purposes of having a disability protected by Civil Rights law. The wrightslaw link provides the information. OCR also has an memorandum on "hidden disabilities," in which it specifically uses life-threatening food allergies as an example. If you are in the US, a city, district, or state cannot define disability to exclude children with anaphylaxis/life-threatening food allergy.