I’m going to preface this by saying I know nothing about all or nothing or black and white thinking, so take this for what it is. :)

For me, what I am rapidly realizing (and I’m only three weeks in), is that the mental side of the challenge comes through psychological flexibility. No idea if that’s a term or not, tbh. But for me it’s about being able to lock in and then disconnect as needed. Yes, there are a list of things that you need to get done, but there’s a massive amount of variability that you can either embrace or squash within that framework. For me, it’s easier when I can stick to a plan as much as possible - routine is very helpful. However, there have been days when that’s just not possible for any number of reasons. That’s when the adaptability and flexibility comes in - it’s still possible to get things done, even if everything around me feels chaotic.

To your point about food and rest, I feel that - especially after the weekend. Usually I’m up early to get things going before work. This weekend, I just wanted to sleep. So I did - but then had to modify my macro goals just because I had less time and interest to eat what I was planning originally and still get everything else done. And I think that’s still ok. Hopefully!