Most Helpful Girl
You need some amount of salt in order to transmit nerve impulses, contract and relax muscle fibers (including those in the heart and blood vessels), and maintain a proper fluid balance. And yes I did copy and paste this from Google because I know salt is important but I didn't remember why lol. But some amount of sugar is in just about everything we eat I'm pretty sure.
Most Helpful Guy
I'm gonna take a wild guess and say you need both to not die.