I asked a similar question in a backpacking forum, not so much about hypothermia, but I was curious if being adapted to a ketogenic diet could potentially make you better able to stay warm on a cold night and reduce the weight of gear you need to carry. There was a huge discussion, but I'm not sure if anybody really knows the answer. I suppose there's one way to find out.
Originally Posted by golangrok
As for hypothermia, once you reach a state of true hypothermia, you're kind of beyond what your body is capable of withstanding by default. It's a serious condition. Lots of things will help you survive it, your fitness level, your basic health, your knowledge of what to do and possibly your metabolic flexibility. Basically, if you can burn your body fat to maintain temperature, you aren't hypothermic. And if you are hypothermic, you can't just sit there and wait. You have to act.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 180lbs, press 72.5lbs and deadlift 185lbs