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I eat no sugar, avoid carbs as much as I can and ear all the fat, saturated or otherwise that I can. I have lost 30kg and my cholesterol has halved. Energy levels have never been better and I only...

As others have said - layers. Either a second sleeping bag, a mat with a better R value or clothes you can wear in your bag. I take two puffs on cold trips (uberlight down vest and hoodded jacket)...