Hmmm. Not Par Deus, and hopefully he'll answer, and correct any mistakes I make
It was my, perhaps mistaken, notion that ketosis was inherently better at preserving lean mass than a normal diet because bodyfat is used preferentially as a fuel-source instead of muscle. Is this not the case?
From my recollection on posts by Lyle, Elzi, Par Deus, etc, I think ketogenic diets MAY have a SLIGHT benefit as far as preserving lean mass, but overall probably not enough to worry about.
I think there is like a 2 week period while the body adjusts to ketosis where ketones are used for fuel. After that, FFA's are used, except for the brain.
I believe Lyle reversed some of his thinking on this after looking again at the studies he quoted in his book. The studies used near-starvation level calorie intake. I think Lyle has stated since that, given adequate protein intake, ketogenic diets aren't really any better than any other.
Is the primary reason a CKD works because the carb-up keeps leptin levels high, and not because of any advantage conferred by ketosis?
Again, based on postings from Lyle, etc., that seems to be the current belief.
How many days do you go for a refead? 3? And is it an entire refeed day or just 1 meal?
I think the limit may be 2 days. Again, if I remember correctly, Par Deus has stated that it takes the body 24-36 hours to actually begin converting carbs to bodyfat. Which is why the refeed needs to be high-carbs and low/no-fat. Fat eaten during a refeed WILL be stored as bodyfat. As you get leaner, the refeeds may need to become more frequent, but not longer.