So, my dad has been hit by this disease (4 years now) and in the beginning it was no beer, YIKES!, only Mikes Hard Lemonade but AB is brewing a Redbridge beer that is pretty damn good . Sometimes difficult to find, surprisingly many Walmart stores carry it, and we just found some at a gas station in Naches on Sunday so it is getting out there.
As for the eating habits of a climber/alpinist....not sure what you eat, but I can say that most of the things he carries out hiking and/or hunting haven't changed all that much. There are some great bars out there, LARA, Bumble Bars, and ThinkThin (protein). He doesn't use any GU so I'm not sure of the label on that one. Bread is the tough one, you can buy the stuff that is rigid like styrofoam or the shit that crumbles in the pack, either way they are total crap! The best bread, yes I eat it too when I'm around, is the good stuff that mom bakes up. Trail mixes, cheese, jerky don't seem to be issue for him.
Hope that helps some, I'm sure the lead on the beer will!