I've been using cycling to lower insulin dosage for years, but I still need 3-5 shots a day, but 2 are for a weight control insulin (Byetta). I check for bood sugar on rides longer then 90 minutes, but stretch that on local rides. The only problem I have is cold feet under 70 degrees F. If you carry insulin and sryinges on rides, make sure you have a prescription label for the needles.

Just keep riding. I do use gels and energy bars, but sparingly, and dilutted sports drinks and sugar free sports drinks.