I'm a bit late to the discussion, as I've just made it back from the woods. I fasted from wednesday morning until friday night, so around 60 hours. Broke the fast with some rabbit. I finished the rabbit saturday night. Surprisingly I didn't feel any hunger throughout the fast. This could be partially due to being in a "survival" situation and had other priorities. As for the healing process.. I cut my finger Thursday night, and it didn't stop bleeding until late Friday. I'd say it was probably the cold that affected it, but I'd wager the fasting had an effect as well.
Update: I was absolutely exhausted yesterday. I felt a bit better after rehydrating but not by much. Today I felt surprisingly good. Fantastic energy and a clear mind. However, I went to the gym in the evening and was just destroyed by minimal lifting. I figure I need a day or two before my body fully recovers from the cold. I also weighed myself while there.. I lost 3 kgs in 5 days. That's after rehydrating. I'm now the lightest I've been in 6 years. I've wanted to start eating keto for a while, so I decided to just use this as a jumping point. So far it's going well, though I'm currently having a hard time eating enough fat. Progress will be made.