I've been IF-ing for the last several months, and I've gone through a few 1-3 day fasts, in working up towards this one. Naturally, in the shorter fasts, I only experienced the hardship.
Today, after three days of a sort of mental heaviness, a pall seems to have lifted. I feel much clearer and more upbeat. Perhaps the clearest way to express it is that while through the first three days, and in previous short-term fasts, I was most likely to wonder what I've gotten myself into, today I feel confident about my choice, and have a positive outlook both on the rest of this fast and on life.
I had a short, nice massage done, and I took a long walk in town.
Could be that ketosis finally came full-on, but, frankly I couldn't care less about the sci lingo.
Hunger has been no issue all along, perhaps thanks to my IF-ing or to my pre-fast week long prep.
I have been, and still am, quite weak. Basically, I've been lying in bed, other than token exercise and a daily walk. But the listlessness is gone.
Your experience? Opinion? Would appreciate feedback.