really depends. your body is going to try and extract as much as it possibly can from what you eat before you poop, so what you flush will vary on how anabolic you are, how much you ate at the same time and probably everyone is different.
if you are eating very little you will probably absorb most of the nutrients. but if you drink a whole bottle of olive oil it will be so much that your body cant even process it all and you will end up ****ting out essentially intact olive oil presumably with all its calories intact.