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This advice can do you serious harm in cold conditions. Your body cannot do much better than aobut 80-120 cals per hour of fat liberatin. So if you are working hard,, AND are in sub zero temperatures you can get in trouble. The metaboic path of fat and carbs are very different. So you can do both at the same time. You can digest fat faster than this 100 cal/hour. It's just hard to get it out of your fat cells fast. Older people are even slower at mobilizing fat, but we tend to be well insulated.
– Sherwood Botsford
Commented Apr 16 at 6:36
@Sherwood Botsford: Thanks for your comment, and glad to meet you on the site again. I put in Addendum in response to your comment. Please clarify whether you mean sub-zero F or sub-zero C. I have no experience at sub-zero F. I find sub-zero C (that is, teens, twenties F) merely brisk -- that is, as long as there is a warm, dry sleeping bag at the end.
– ab2
Commented Apr 16 at 19:06
Hypothermia weather. Can be above 32F 0C The key factor on prolonged thermal stess. Being underdressed for the circumstances allows it to happen at higher temps. One issue is just the energy to bring the humidity of the air you breath to a level it doesn't dry your lungs. Nasal passages are designed to bring it up to close to 100% RH at body heat. Crank some numbers: The energy to heat the air up is peanuts. The energy to evaportate enough water to moisten that air takes aobut 25% of the calories in the food.
– Sherwood Botsford
Commented Apr 17 at 22:25
Not as bad as it sounds,as the body is not very effient. Like the IC engine, it creates alot of surplus heat. If you wish to chat out of band. I'm sgbotsford at the mail domain run by the search engine.
– Sherwood Botsford
Commented Apr 17 at 22:26
Thanks for the offer to chat, but I will decline. At least not on this topic. As for hypothermia as a consequence of being underdressed for the actual and foreseeable situation, that is just one of many ways that oblivious people can get in trouble. I am sure you have dealt with many of them, as I remember that you have led many groups in the outdoors. Cheers!
– ab2
Commented Apr 18 at 2:23

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