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Dietary sodium is also called "salt", sodium helps your nerves and muscles work properly. Table salt is made up of sodium and chloride. Your kidneys control how much sodium is in your blood, releasing it when needed and flushing out any excess. If too much sodium builds up in your blood, this may raise your blood pressure. High blood pressure is linked to serious health problems. Federal dietary guidelines in the United States recommend that most people limit their intake of sodium to less than 2,300 milligrams (mg) a day (less than 1 teaspoon of salt).