Thanks to so many of you who comment and have helped me out!
I was asking about fasting (I was doing it too much-unintentionally) and about a planned Cheat Day.
I have one commenter (Hi Joseph!) who is really knowledgeable and has graciously given some time to answering my questions. He says it so well, I thought I would just re-post what he says.
Regarding Intermittent Fasting:
Regarding Cheat Days: