When I worked as a paramedic, we generally chauffeured at least two--and often several more--diabetics to the emergency room on Halloween night. They were often children or adults who hadn't yet been officially diagnosed. Generally the diabetics, at least the compliant ones, who're already aware they have that condition know to be extra careful with all the sugar that's around on candy-laden holidays.

Choking is also a particular risk on Halloween. Little kids and hard candies are sometimes a bad combination. All parents need to learn the Heimlich maneuver!