I think it was this summer that I read a news story reporting that diabetes was not considered an ADA disability. The specific incident reported was about a diabetic woman who worked at a job that did not permit her to eat at her desk. She passed out at work and brought this case, which was unsuccesful.
I’ve had poor luck searching for this article. If anyone can provide a citation, link, or other source for it, I (and my students) would be grateful.