TSandM:
Also be aware that losing weight, increasing your exercise levels and controlling your diet can contribute to a lesser need for medication, or even get some people off meds altogether.
Only if it's Type 2 (Adult Onset) diabetes, if it's Type 1 (Juvenile) diabetes you are on insulin for life. Though exercise is still important to all diabetics (Type 1 and 2) as it's one of the sides of the triangle, along with Insulin and Diet.
I'm an active Type 1 (Juvenile) diabetic diver (38 years old, diabetic for 22 years), and I'm open to any questions.
The most important things are good control, ability to recognize hypoglycemia, doing lots of blood tests, and informing dive masters, organizers and buddies of your condition, along with the symptoms of hypoglycemia and treatment of hypoglycemia before every dive. I guarantee you'll get some operations who are wary of letting you dive, so I carry a copy of my PADI physical form completed by the doctor. Though, I've heard some whispers, I've never been stopped from diving and after the first dive everything usually becomes normal. You should have seen the faces of the office staff in the Galapagos on my arrival.......
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I for one test my blood sugars immediately before every dive, and immediately after every dive (sometimes difficult with prune like fingertips, but I manage). I have 2 blood testers, my everyday one (which stays at home, hotel, or in car when diving) and my sport one which accompanies me on the dive. The reason for 2 is in case someone drops a weight belt on my dive bag on the boat, or it gets kicked overboard, etc. Having 2 means I'm won't be in trouble, especially when on vacation.
I usually dive with my blood sugars a little higher than normal to be on the safe side (i.e. a normal blood sugar means I have something to eat before hitting the water). I carry a couple of small tubes of liquid cake icing (pretty much pure sugar) in my right BC pocket (my buddy and DM know they are in right hand pocket) in case I'm in need of sugar.
Also, I have a full physical done every second year by a hyperbaric doctor, in addition to the regular visits to my endrocrinologist, just to be on the safe side.
Let me know of any specific questions you might have on diving and diabetes.