I am susceptible to AMS, and although this may not be directly applicable to a Whitney day hike, it shows what can happen:
Thu: drive in, sleep at 10k Horseshoe Meadows
Fri: 10k - 11.6k, sleep at 11.6k
Sat: 14k - 10.8k - 11.5k (puked that night.)
Sun: 11.5k - 12.6 - 10k
Mon: 10k - 9.5k - 11.5k
Tue: hike out: 11.5 - 13.3 - 8.3
I was not hungry at all during my 5 days on the trail, after the first day. On the second night, I forced myself to eat a Mountain House Mexican Rice with Chicken dinner, and just after the last bite, I stood up and lost EVERYTHING!
Felt better afterwards, though.
I ate so little on the hike that I didn't need to dig a cat hole the last three days.
I was taking 125 mg Diamox, and sometimes half (2x per day) that for the first 3 days. I only had a light headache once in a while. Fingers tingled several mornings. But I am pretty sure my exhaustion from hiking/climbing too much each day contributed to my AMS issues.
