I have had some remedies for the fasting chills that mostly focused on blood volume and circulation. So I agree.
The first was to keep salts high to make sure that blood volume didn’t diminish substantially due to water loss. I still believe this is true but I’m now in an equivalently dehydrated state to my deep fasted state according to my weight. But in the previous fast, I was in deep chills. In this one, I’m very warm… I’m still trying to keep my salts and hydration up but I did that last time… with minimal results.
The second is that the body needs to increase circulation to fatty deposits in order to extract lipids there. That necessarily reduces flow to the extremities. My solution to that was the application of cold packs to the fatty deposits to cool down the blood circulating there causing the body to upregulate thermogenesis which increases heating to the whole body, including the extremities. So if flow is reduced, then I’ll increase the temperature flowing there to get warmer. Again- I did that before and doing it now.
The only difference is that there’s less belly fat, so maybe there’s more cold pack cooling of the circulating blood?
The third is blood vessel dilation. Basically, under stress, the extremities’ vessels contract reducing flow and the flow is directed to the vital organs. For that, nitric oxide is important so beet extract and sunlight/UV has been my remedy… but again- I’m doing the same things.
The fourth is temperature stress: sauna and cold to increase dynamic flexibility … doing the same.
The fifth is thermogenics like cayenne and cinnamon extract… doing the same again.
The only thing that’s changed is probably the amount of body fat and lean mass and the dose of Leucine I’m taking.
I’m researching the Leucine ketone effect … the Leucine availability in the blood seems to be a really potent metabolic driver.