I've been incorporating more fasting into my routine. It seems sort of natural with weather setting in, and in the wild food would become more sporadic. Anywho, I pulled 41 hours last week, and am aiming for 48-72 hours this week.
Early on, fasting was difficult, but it gets easier. 41 was surprisingly simple last week so I don't anticipate any problems with going as many as 72. Just for curiosity's sake I started poking around the internet to see what I could find (in case anyone wanted to freak out on me about it.) One site was particularly interesting. Thought you might think so too. Especially the "true hunger" page that it links to.
Effects of Fasting Ketosis | AllAboutFasting