I am a type 1 diabetic (have been for 15 years.) I check my blood sugar 6 times a day, and I drink a lot of Crystal Light. I've never seen a change in my numbers due to drinking it. Maybe it's different for other people, but it's never raised my sugar levels at all.
Starting weight: 192.0 lbs (6/19/2011)
Lowest weight: 154.6 (6/25/2012)
Current weight: 162.8 lbs (1/28/2013)
Total lost: 29.2 lbs
Goal: 132 lbs