It's like you're failing to understand the context of the situation. The b12 argument is especially pertinent with regards to this case specifically. Nepal is a region with very low b12 in their diets. Combined with the shitty logistics involved, and a non-typical iron requirement for climbers... it just makes you look foolish. BTW, the research and data is there. A vegan diet is not as healthy as a healthy balanced diet. Please spare me the study that compares health conscious vegans to the average american because I'm not interested in comparing any health conscious group to a group that is by and large not health conscious. It just makes you look as if you lack any and all critical thinking skills.