National guidelines recommend not getting more than 2,300 milligrams of sodium a day (about 1 teaspoon of table salt). The limit is 1,500 milligrams a day for some people, depending on age and other things. By staying on a sodium-restricted diet, your systolic blood pressure (top number) may drop two to eight points. Salt-restricted diets can also help enhance the effects of most blood pressure medications.
Tip: Substitute herbs for salt when cooking, and avoid processed meats and canned foods.