Most of us are aware that you can do just about anything when you have diabetes. The hard part is knowing what issues to address and plan for. For example, insulin can freeze, which not only makes it impossible to inject but also renders it less effective. Insulin also stops working if it gets too warm. When the small electronic blood glucose meter used to measure sugar levels is taken to higher altitudes, the chemistry of the device changes.
Climbers worry about their insulin pumps failing much more than their watches.
There are all these factors, some not completely understood, that interact with diabetes. We have to decide how to control variables like how much insulin to take, how much food to eat and how much activity we can do. Some things we do from experience, and sometimes, we have to guess what will happen.