Salt and High Blood Pressure

Sodium: A Good Thing...in Moderation
We may malign the salt shaker, but sodium plays an important role in maintaining the body's fluid balance. It's essential for muscles and nerves to function properly. But most of us consume too much of it. FDA guidelines call for less than 2,400 mg of sodium per day -- about 1 teaspoon of table salt. Surprisingly, most of our salt intake doesn't come from the salt shaker; it's hidden in many of the foods we buy at the grocery store.

MedicineNet.com