Trips Outdoors, Type 1 diabetes Why am I always high (hyperglycemic) at high altitude? April 3, 2016April 3, 2018by Julie Hooper, MPH, RDLeave a Comment on Why am I always high (hyperglycemic) at high altitude? This week I set out to discover why I seem to be more insulin resistant when I'm at altitude. From Hyperventilation to Hemoconcentration, learn what happens to your body at high altitude. Share this:TwitterFacebookPinterestEmailLike this:Like Loading...