Will I eventually be physically transformed?"
"Into some aged, pale-skinned, raspy-voiced, yellow-eyed monster, you mean. Such as the one you see before you. Surely you are acquainted with the lore: King Ommin of Onderon, Darths Sion and Nihilus. But whether it will happen to you, I can't say. Know this, though, Sidious, that the power of the dark side does not debilitate the practitioner so much as it debilitates those who lack it. The power of the dark side is an illness no true Sith would ever wish to be cured of.