I'm recovering from a long, baffling, and severe illness. At least and at last, I am using the word "recovering"

What is really becoming clear as I get appetite and energy back is how dramatically my wellbeing plummets when I don't eat right. I have been getting ruthless the last couple of weeks about seeing how low I can comfortably go, and two meals a day, all protein and fat and only carbs from non-starchy veg and the like, and things are continuing to improve.

But day to day, especially on a feeling-like-crap all the time baseline, that is not going to be so obvious.