[duck]

I did my CISSP in August...Though I had the benefit of CGMS, the proctors told me after the exam that they make accommodations for medical needs, so if I needed to test frequently, I would have been allowed to get up and test as often as possible (as it was, I wrote and warned them I would be attached to a Pump/CGMS, not to freak out and think it was some sort of device for cheating...anyway, to accommodate, they put me near the door in the back so I could indeed get in and out with little to no distraction).

Now, as far as what foods? Now is the time to test your endurance and what foods would work best for you. I literally only ate a small breakfast, and took some beef jerky in a clear plastic bag and some water in with me...Even with the stress of the exam, I stayed VERY stable through lunch time. I finished my exam about lunch time, so I stopped and put the booklet away (I was going to go over all my answers), ate lunch, and looked over all my answers. All in all, according to CGMS, I never tipped 200 and never got below 120 that day. But I had been preparing for it (from a diabetes-standpoint) for a few weeks.

So in short, test, prepare, and make adjustments as needed before the exam. And let your proctors know you may need to test your blood sugar, etc, just to avoid suspicion.