I was told boron supplements help with body heat. Haven’t exactly tried it per say, but I started taking my multivitamin gummies (which contain boron) and I haven’t been as cold since. On day 11 of my fast for reference. But basically, it’s the lack of heat generated from food digestion that is making you feel colder, breaking down food generates a surprising amount of heat!
do random fast cycles. few weeks back did a 72 hour fast and day 2 was cold and had headache. previous fasts never had headache, but have been cold. The fast was the one coming off of high carb thanksgiving, which may have had something to do with it. Did you just cone off of high carb into fast?
Coldness is a side effect. I imagine you’re not very well fat adapted at this point, especially if you eat over 50g total carbs per each (day?) meal that you wind up having. Metabolic cycling like this (burning fat vs burning sugar) will necessarily mean that you’re shutting down thermogenesis in an effort to save energy during fasting periods.
I bet if you turn down your carb intake you’ll be less cold during fasting days. I know that fixes my cold issues.
Update: Coldness is gone.
I am now on hour 24 of 48 hours fasting. I still do all the things I’ve mentioned above (36-48hrs. fasting, OMAD, Calorie counting, well hydration, electrolytes). The only thing that changed is that I limited my carb intake on the last meal I had, only hours after feasting the coldness is already gone. Up until now I don’t feel cold. I will keep on limiting my carb intake and if the coldness happen again, I will reply to this comment.
Thank you all so much for your help 🤍