I'm solidly convinced it isn't poop.
Just had a colonscopy. I've been pushing my weight up a little, so i could do the colonscopy in the midst of modest weight gain (pushed up from 168 to 172).
So, weighed in after all the prep, weight was 169.6.
Went out and ate a carb rich meal at IHOP, next morning weight was 173, so I dropped three pounds with all the poop removed from my system on an at least neutral diet (i.e. where I wasn't losing weight) and with everything I could eat, still only got back to 174. I'd say poop is the least amount of it.
Carbohydrate unloading? I think that is a bigger part of it.
Me, right now? Sorry, couldn't eat much today. Guess it is time to trend down again for a while.
Currently doing SLD calories as olive oil mixed with protein powder and milk, taken with a nose clip in the place of dinner.