It wasn't a freak storm or pulmonary edema that nearly derailed Dave Hahn's attempt to top out on Mount Everest for the second time. It was a piece of bread. For two years, the mountaineering legend had battled a host of maladies - upset stomach, diarrhea, and lingering weakness - but never suspected the foods he was eating to fuel himself (pasta, cereal, bread) were the root of his problem. Hahn, it turned out, had developed celiac disease, an autoimmune response to gluten, a protein found in wheat.
Outside, July 2011