Juliana.Rivers:
the point 2) resting of digestive organs... can you elaborate there for me Peebles
Well, there is nothing scientific about this, as it is based solely on my own experience. But not putting food in my stomach for almost 24 hours (since I am doing pretty much the same thing you are) seems to have given my esophagus and the irritated parts of my stomach a chance to heal. For a while there everything I ate was hurting, as the whole thing was highly inflamed. It was scoped and biopsied by a gastroenterologist, which confirmed my subjective experience. Even after taking powerful drugs it stayed inflamed for quite a while, and only seems to have calmed down when I started fasting.
So that made me think that just giving our whole digestive tract a chance to not have to deal with food and the acid that is produced each time we eat might be helpful. It might also, and this is again highly speculative, take some of the burden off the cells in the upper gut that secrete the various incretin hormones that help modulate digestion and control blood sugar. This could explain some of the improvement in blood sugar control people report that is not explained by diet, since people are eating carbs on their off days, and in theory this should keep their blood sugar high.