Loss of appetite

You went from sea level up to 11,600 feet in a very short time. Loss of appetite is a typical symptom of altitude sickness. You're lucky that this was your only problem!

http://www.princeton.edu/~oa/safety/altitude.html

If you are hiking hard for a long time, most of your circulatory system is supplying your large muscles, and there is little left over for digestion. As a result, you may eat a snack, and the lump will just sit there in your stomach. With that happening, your appetite won't be much.

This may not be a solution for everybody, but it works for me. I can go a long way on Gatorade. Also, I carry something really small and simple, like jelly beans. That will get me through the hard work until I can take a break. Then a small but substantial snack will be good.

–B.G.–

"You went from sea level up to 11,600 feet in a very short time."

How did you assume that this was in a very short time?

–B.G.–

He said on the 2nd day…so that would be a short time most likely.

Totally, totally normal to lose your appetite at altitude!! This is why I pack thin brothy soups if it is going to be hot and with climbs. I can sit and drink a small cup of soup, get back needed nutrients and that helps. Whatever you do though…heavy meat and cheese is really hard on the stomach – it can easily lead to barfing it up.