JAK...

Absolutely. He started out shortly after eating a nice breakfast and resting. He was also a well developed, athletic young man with plenty of energy reserves. Shivering violently burns something like 220kCal/hr. That's alot of calories. Imagine trying to maintain an adequate shiver on empty fuel tanks.

Food, water, insulation. Must haves for any hike where hypothermia could be even a remote possibility.

MNS