Rabbits don't wear glasses
I know you may like to eat sugar, but when you eat too much of it and your blood-sugar levels rise, then my good friend Pancreas releases me into the bloodstream to restore blood sugar levels to their norm.
I stare at you, you stare at me.I have three eyes, yet can't see.Every time I blink, I give you commands.You do as you are told, with your feet and hands.What am I?