We live in a tropical climate in the plains. Last weekend we went up to the hills - about 2500 m above sea level. The weather was much colder in the evenings, though just a bit cooler in the daytime. I found that for the same insulin regime and activity, my daughter seemed to need almost 25% less food to maintain normal glucose levels. About 4 months back, we had again taken her to a higher altitude, and for that entire week she had horribly high numbers. We couldn't figure out then what the problem was, and thought maybe she's stopped honeymooning. but this time we were prepared so I fed her less and found that working better. We're back home now, and things seem to be back to normal. Anyone experienceed this? Do you think it's the higher altitude, or is it the lower temperature?