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I'm no doctor, but I have been T1 for 24 years. I gave up caffeine about 15 years ago because it messed with my BG and made my heart race (to the point where it was over 200 beats per minute! and I had to be put on a drip to bring it down). If I have it right, you are wondering if the caffeine itself is causing hypos... Someone else mentioned cortisol - my own thinking is that we tend to think of a simple cause and effect scenario: Caffeine = hypo. It isn't simple, I believe that it is possible that the caffeine causes a cortisol and/or adrenalin response, which sets off a whole chain reaction in the body which leads to a hypo. Decaff works for me.
But did it put your blood glucose low or high? You only say it was "messed with".