I agree that its intuitive that to prevent frostbite, it would be appropriate for the body to increase blood flow through extremities and (assuming core tempera

I agree that its intuitive that to prevent frostbite, it would be appropriate for the body to increase blood flow through extremities and (assuming core temperature has a narrow functional band) increase heat loss / caloric output in the process. And that this would result in loss of energy stores much faster -- good if you have a large caloric surplus available most days, bad if you are experience extended starvation in the wilderness. Though as with everything relating to health, I'd like to see some data/information to confirm my naive bias/opinion.