Fantastic explanation! In 2013, I did a 9-day fast for spiritual purposes. I was extremely nervous about it and was embarrassed to tell anyone about it. I participated with a group, which helped to keep me motivated, and we were allowed to pick one fruit and have some everyday, so not completely without food. It’s one of them best things I’ve ever done for my health. I will do it again and maybe stick to your suggested 72 hours. Sounds like a body “reboot".