I could have written your post a couple months back - the magnesium at night thing is what finally broke my streak too, and I add a scoop of fiber powder to my morning coffee now that I'm further along. Funny how the fatigue fix being protein shows up in every thread, it was night and day for me around the 30 lb mark. Boring bathroom days are the goal, ha.
Constipation is brutal, what actually helped?
At 24 lbs in I'm in the same boat, still managing it weekly. The routine timing ended up mattering more for me than fiber itself - sitting down at the same time every morning even if nothing happens trains things eventually. Magnesium citrate at night plus not skipping my morning walk is the combo that keeps me mostly regular.
Magnesium citrate at night is what saved me too, and I'd add that a daily walk helps more than you'd think - I noticed a difference on the days I got moving even just around the block. Down 55 lbs on Mounjaro and constipation is still the one thing I have to actively manage, so don't feel like you're doing anything wrong.
Coffee first thing plus magnesium citrate at night is the combo that got me moving again around the same point you're at now. I also cut back on the fiber supplement honestly - it was bulking things up without the water to match. Give it a week before you judge whether it's working.
Only 9 lbs in and I already learned the hard way that fiber without enough water made things worse, so that last point clicks for me. Magnesium citrate at night is what finally got me moving again too, took about four or five days to kick in. Still early for me but this med is worth the hassle so far.