considering the role sodium and potassium ions play (http://en.wikipedia.org/wiki/Sodium_in_biology#Animals), it isn't surprising that too low of them is bad. Of course it is already well known that too much of them bad also.
"Sodium is an essential nutrient that regulates blood volume, blood pressure, osmotic equilibrium and pH;..."
doesn't it sound like it better be not too low and not too much ? :)
If you're a proponent of low sodium then you don't believe the amount of sodium you advocate is "too low", you believe it's correct, and that the standard amount is "too high".
"Sodium is an essential nutrient that regulates blood volume, blood pressure, osmotic equilibrium and pH;..."
doesn't it sound like it better be not too low and not too much ? :)