lulubelle
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The ability of your wife to dive safely is not as dependent on whether or not she has Type 1 or Type 2 diabetes, but is more dependent on whether or not she uses insulin (and to a lesser degree, some of the older classes of oral agents) to control her disease and how frequently she is hypoglycemic. It would also depend what type of insulin she uses and it's pharmacokinetic profile. If she is never or rarely hypoglycemic, then running her blood sugars a bit high before a dive and having a small snack before the dive will increase her margin of safety during the dive. She should also check her blood sugar pre and post dive. But this is really a question to be taken to a dive medicine physician. There is no one size fits all answer to your question.