if a human could not feel hunger, thirst, pain, sexual desire, fear, tiredness, or literally anything else, they'd be considered braindead. we already don't consider them conscious.
E.g. put the subject on a drip so that none of the hunger senses are triggered. Automatically manage the body's water balance with sensors and a feeding tube. Restrict them so that they can't hurt themselves to feel pain. Modulate their sexual hormones to inhibit sexual desire. Etc., etc.
Do they stop being conscious?
E.g. Let's imagine we get some cybernetic approach that can work around an inoperable deep brain tumour in the brainstem.
Without the prosthesis the person is in a coma or dead. With it they are normal, but need to be connected to the prosthesis.