Earlier this year I had my regular blood tests and my GP was surprised that my HbA1c reading had shot up from 39 to 68. He asked me whether I had been eating things I shouldn't. I said no. I couldn't understand it, as I was still eating the same food and exercising regularly. A few days later I suddenly thought of the possible answer: after not drinking much coffee for years I was given an espresso coffee maker last Christmas and started drinking three or four espressos a morning. I wondered if that was the reason and decided to cut out the coffee entirely. My next HBA1c reading three months later was a much better 45. Has anyone else experienced this problem with coffee? Is it the caffeine or something else in the coffee that increases blood glucose?. The strange thing is that recent research seems to show that coffee helps to prevent type 2 diabetes!