I went to bed early tonight but woke up, as I think the siren call of PB's illuminating keystrokes beckoned me here... 
I'm just starting another 48 hour fast, had 2 fatty, low carb, low protein meals earlier today, to hasten a ketogenic response. Will break this fast this time with same, fatty & low or no carb, low protein. I think, like PB, that 48 hours is the sweet spot. So maybe I won't do a 10 day fast in Hawaii in November after all, as it might be too harsh, & actually metabolically better to just keep doing a weekly series of 48s. Although I must admit that one 100 hour I did was a cool feeling...When you fast for a longish time, you kinda start to feel like you could just keep doing this, the not eating thing. jaja...
"Science is not belief but the will to find out." ~ Anonymous
"Culture of the mind must be subservient to the heart." ~ Gandhi
"Who you want to be, isn't necessarily who you are." ~ Ginger/Gina