Having read the whole Tracking intake thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby one instead.
Follow-up: Tracking intake honestly when appetite is absent posts 61–90
This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.
Confirming post #61 from a second method, which matters more than confirming it from a second person.
Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per kilogram of body weight. Individual requirements vary but that range is a reasonable starting point.
Stating my assumptions rather than smuggling them in.
Micronutrient adequacy becomes a real question at very low total intake and is much less discussed than protein.
I keep a log of this specifically because memory is unreliable about it.
The practical problem is that appetite suppression makes hitting a target genuinely hard, and "eat more protein" ignores the actual constraint.
Answering the question post #66 raises rather than the one it answers.
Eating anything at all: on substantial appetite suppression, eating enough total calories to maintain lean mass is the priority. Protein comes second to total intake.
The arithmetic in post #66 is right; the assumption feeding it is the part to check.
An update on my earlier Tracking intake post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Fibre: adequate fibre intake supports fullness and gut motility, both of which matter during the gastrointestinal effects of these compounds. High fibre on top of appetite suppression requires attention to hydration and gradual introduction.
Someone will know this better than I do and I hope they say so.
The mechanism is not mysterious. Substantial energy restriction with inadequate protein and no resistance stimulus loses lean tissue as well as fat.
Tracking intake for a week rather than permanently is usually enough to find out whether there is a problem. Permanent tracking has its own costs.
Answering the question post #70 raises rather than the one it answers.
Tracking intake is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.
Everything in post #74 holds. The case it does not cover is the one I have.
Practical answer on Tracking intake, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the complicated explanation is needed. It usually is not.
I had written a reply contradicting post #78 and deleted it. Here is what survived.
The version of Tracking intake that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those conditions are where the interesting cases live.
Self-reported intake is optimistic by a consistent margin in the published comparisons, which is worth applying to your own numbers.
I am reporting what happened, not recommending it.
Published guidance on protein during weight loss is reasonably consistent and is easy to find, which makes this one of the better-evidenced practical questions here.
Not the whole picture, but the part of it I can speak to.
I had written a reply contradicting post #83 and deleted it. Here is what survived.
I read the earlier replies on Tracking intake twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said rather than what I expected.
I read post #87 twice before replying, because I had assumed the opposite.
Checked the Tracking intake claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.
Useful. I had the fact and not the reason, which turns out to be the important half.