Irishred (once again - thank you for this thread) - let me throw in my 2 cents’ worth: maybe addicting, yes, and I’d say a good bit of that is us wanting fast results, and longer fasts do increase the rate and magnitude of some desirable things, i.e. weight loss, decline in insulin levels, and autophagy, to mention three pretty big ones.
I love this chart - it’s showing that increasing insulin levels - even fairly small increases within what is considered the normal range - really slows the body from breaking down fat. Those of us with insulin resistance may struggle to reach the desirable insulin levels for fat-burning. I’ve read that most of the decline in one’s insulin levels will occur in the first 24 hours of fasting, yet that means there is still more to go, and if I begin high and am resistant to the lowering of it, then I figure the longer the better, on that score.
Insulin resistance also suppresses autophagy. I’ve read that the peak times for autophagy during fasting begin on day 2 or 3, and last for around 3 days, for most people. I want to get into the really good zone there, so multiple days are definitely called for.
Weight loss: I don’t really even get the “fasting” feeling until the second day. I ate yesterday evening, and then started the August Zornfast. It’s been about 21 hours and there has been nothing today as far as hunger. 2 little cups of coffee this morning, no salt or supplementation, and it’s not even a thing at all yet. Tomorrow maybe will really feel the deal. I don’t know that this is true, but if anything it feels like I’m still running on leftovers from yesterday and the night’s digestion - blood sugar and liver glycogen.
How long to digest a meal, before everything has gotten out of the stomach and all the way through the small intestine? 6 hours? 9 hours? I don’t think a “fast” really kicks in until then, and that there’s another level at the later point where the 'easy energy" of blood sugar and liver sugars are depleted.