Hi. I can't tell you what the effects would be on you personally, since all diabetics react differently to situations. I can tell you that I have had insulin dependent diabetes for 26 years and that I have climbed mountains and jumped out of airplanes with no problems. My last jump was a high altitude jump. The only effect was a day long high from the rush! Any time I have been climbing, the only thing that I had difficulty with was the heat. I started climbing with a wet shirt on to help with that. I can tell you that you absolutely should bring your monitor, Life Savers, and juice boxes are really great for strenuous exercise such as mountain climbing. Also, I don't know who you are going climbing with...but always make sure someone knows your situation. That way, if you run into any problems there is at least one person who can help out. As always, talk with your doc and find out what he/she has to say or advise on the awsome climb you have planned. I hope you have a great adventure!