This is the version of the explanation I wish somebody had given me, written down before I forget what confused me. It is about protein intake, and it is deliberately narrow — everything I am not confident about is marked as such.
What is actually established
On a suppressed appetite the winning strategy is protein density per unit of volume, not per calorie. Isolate powders, Greek yoghurt and cottage cheese, egg whites, lean fish, and tinned tuna all deliver a lot of protein in a small physical volume. Front-load it: appetite is usually least suppressed in the first hours after waking and worst on the day or two after dosing, so get the majority in early in the day and early in the week.
The condition it depends on
Anyone with reduced kidney function needs that target set by a clinician rather than a forum. High protein is safe in normal kidneys and is not automatically safe in impaired ones.
The practical version
The arithmetic that makes it tractable: reference weight in kg times 1.6 gives the target; divide by four for a per-sitting figure; then find four foods that hit that figure in a volume you can actually finish. Most people need two of the four to be liquid or semi-liquid early on.
What I am not sure about
What would genuinely help is knowing how people are hitting a protein target on a genuinely suppressed appetite, because volume is the binding constraint rather than willingness. If the honest answer is that nobody knows, that is a useful answer and I would rather have it.
— PeptideSynthNJ · corrections welcome and will be edited into this post with credit