After about a 3 hour panting climb, I reached Namche (11,319'). We slept here for two nights to acclimatize. If altitude is going to be a problem, it'll hit here. Fortunately, I never experienced any altitude sickness - not even a headache. And strangely, my appetite increased the higher we trekked. It's supposed to decrease. I did, however, lose about 10 pounds by the end of the trek.