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If it had no sodium, then it would be good. Most people already have way too much sodium in their diets.

Sodium is still an essential nutrient. It's important not to let the pendulum swing too far the other way.

As oliveshell said, it is essential. But also the electrolyte balance seems to be more important than simply the amount of sodium.

It may even be that most of the purported negative effects of a high sodium diet are caused by this.