Articles like this one about electrolytes are a perfect example of why nutrition is such a confusing subject.  I grew up hearing how bad salt is for your health, and how it should be limited.  Certainly not the case from reading this article, which talks about all the benefits of sodium.  Its probably all a question of getting the right amount, which the article does not address. It also doesn't distinguish between hydration without salt and hydration with salt, or how much of each you need.  

Does an average active person's diet typically not contain enough sodium? Or too much?  You won't find out by reading the article, even if you're convinced of the value of electrolytes.  And adding salt to your meals doesn't seem like a terribly sensible suggestion.