zor:QUICK UPDATE:
I just finished my open water certification this weekend. Had lots of fun trying to adjust the bg (blood glucose). For me, since I've never had any problems with hypo glycemia causing seizures or any other extreme symptoms that would interfere with me safely getting out of the water, diabetes is simply an inconvience for recreational diving. Aulthough I was usualy droping rapidly when I got out of the water, I was usualy alright, and only went low once on my open water weekend. My sugars were from 210-280 getting in and from 90-110 getting out. The only time I was low, I started having symptoms after I surfaced and was getting my gear out, and was 57 mg/dL. Aulthough that is fairly low for some people, I've been as low as 21 once and was still able to function. That was a rather scary experience a few months after I was diagnosed (which was 6 years ago I might add) and I wouldn't want to repeat it, but I do at least know I can function at very low sugars if it comes to that.
The reason I say it was an inconvinience is that its easy to cary sugar underwater and on normal recreational dives, if I were to get low, all I'd have to do is surface and eat some sugar. Possibly I wouldn't even have to surface If I can find a way to drink juice underwater. The real problem is balancing the sugar: I had to get in with a high enough sugar that I wouldn't go low, but not so high that I'd have to go to the bathroom really bad and get out early. Over all, the biggest problem was that I was so tired from the stress of my first real dives that I wanted to eat continuously and ended up pretty high a few times. However, just by my forth dive that was much less of a problem and I think a lot of that stress on my body will decrease with expreience, and that this will become simpler when I'm more relaxed in the water.
Squeeze tubes are easy to eat underwater.. You can put mashed up fruit and or juice in it.. Its no different drinking underwater as above it.. Just practice it in a pool until you are confortable.. You are a new diver so your confidence and skills have to be practiced..
Babar -
I think you mis-understood me about the glucose solution.. Many of the tech divers I know that are diabetics PLAN to eat what they are carrying sometime within the dive if its a long dive.. This Insures they are getting some sugars into their blood... and they usually eat something high in carbs (right before they jump in) that isn't digested too quickly..
WHen I do technical diving with long run times (my longest is over 7 hours - but normally are in the 3-4 hour run time) I get hungry AND I get thirsty.. I usually have a squeeze bottle with a drink, there is no reason it couldnt be a fruit juice for a diabetic that could be planned to drink during the dive, even a few sips periodically to keep the levels consistent.. For Open circuit divers there is SCUDA which hooks right to the mouthpiece..
http://www.scuda.com/The_SCUDA.htm
I am a RB diver so when I need to drink, out comes the mouthpiece..
I wouldn;t worry about short time High Glucose, I'm more concerened with low glucose..