Earlier quoted context omitted.
Autophagy keeps getting brought up with such pseudoscientific bullshit explanations that I can't help but see it as snake oil. Furthermore, depending on who is describing it, the window for autophagy to kick in is anywhere from 8-48+ hours.
I don't know what science you need to understand a system that is constantly active and is never fully allowed to rest will develop dysfunction. Anyway, as the sibling reply says, there is plenty of reputable research available to satisfy your curiosity if you wish.
Does my circulatory system need to fully rest so as not to develop dysfunction?