Let's just say that I decided to take some poor, perfectly healthy human being and instantaneously remove a bunch of cells, maybe 5%, from their body. I would remove the cells evenly, so that you would have 95% of red blood cells left, 95% of the number of brain cells, etc. Effectively, they would be 5% lighter. Only living cells would be affected, not water or ingested molecules.
For the purposes of this question, I could accomplish this in two ways:
replace the cells with some noble element that (hopefully) wouldn't interfere with the body, or just simply remove them and leave some empty space where a cell used to be.
What would happen either way, and could our test subject hope to survive at all?