Sodium is an element that the body needs to function properly.

The body uses sodium to regulate blood pressure and blood volume. Sodium is also critical for the functioning of muscles and nerves.

Sodium occurs naturally in most foods. The most common form of sodium is sodium chloride, which is table salt. Milk, beets, and celery also naturally contain sodium, as does drinking water, although the amount varies depending on the source.

Sodium is also added to various food products. Some of these added forms are monosodium glutamate, sodium nitrite, sodium saccharin, baking soda (sodium bicarbonate), and sodium benzoate. These are ingredients in condiments and seasonings such as Worcestershire sauce, soy sauce, onion salt, garlic salt, and bouillon cubes.

Processed meats, such as bacon, sausage, and ham, and canned soups and vegetables are all examples of foods that contain added sodium. Fast foods are generally very high in sodium.

Too much sodium will contribute to high blood pressure in persons who are sensitive to sodium. Most people with high blood pressure may be told to reduce their sodium intake. If you have high blood pressure, you should discuss this issue with your doctor.

Sodium may lead to a serious build-up of fluid in persons with congestive heart failure, cirrhosis, or kidney disease. Such patients should be on a strict sodium-restricted diet, as prescribed by their doctor.

Dietary sodium is measured in milligrams (mg). Table salt is 40% sodium; 1 teaspoon of table salt contains 2,300 mg of sodium.

The National Research Council of the National Academy of Sciences recommends 1,200 to 1,500 mg of sodium each day for adults. Persons with high blood pressure should have no more than 2,300 mg of sodium a day. Those with congestive heart failure, liver cirrhosis, and kidney disease may need much lower amounts.

Specific recommendations regarding sodium intake do not exist for infants, children, and adolescents. Eating habits and attitudes about food formed during childhood are likely to influence eating habits for life. For this reason, moderate intake of sodium is suggested.