The American Heart Association (AHA) recommends eating less than 1,500 mg of sodium a day.
Sodium intake can raise blood pressure in people predisposed to having high blood pressure , which is a major risk factor for heart attacks . Some people who have high blood pressure are described as also being "salt sensitive." This means that their blood pressures are likely to increase when they eat a high-sodium diet, and conversely, their blood pressures may be lowered by limiting dietary sodium.
Salt sensitivity is difficult to accurately diagnose. Therefore, appropriate sodium recommendations are a subject of great debate among nutrition experts. Some believe that all people should limit their sodium intake to either treat or prevent hypertension regardless of their present blood pressure level. Others, though, advise that only people with hypertension or those who are believed to be salt sensitive need to limit sodium in their diets.
Nutrition researchers are still trying to tease out the exact role of sodium in hypertension. A major study in this area is DASH —Dietary Approaches to Stop Hypertension. This study found that a diet rich in fruits, vegetables, and low-fat dairy products, and low in saturated fat, cholesterol, and saturated fat—now called the DASH diet—helped lower blood pressure. The second phase of the study found further reductions in blood pressure when the DASH diet was combined with a sodium intake of no more than 2300 mg/day.
Sodium is found in many foods. Some are obvious, but others may surprise you.
Table salt (sodium chloride; NaCl) is the major source of dietary sodium—about 1/3 to 1/2 of the sodium we consume is added during cooking or at the table.
Fast foods and commercially processed foods—canned, frozen, instant—also add a significant amount of sodium to the typical American diet. These include:
Sodium occurs naturally in:
Other sources of sodium in the diet:
All food products contain a Nutrition Facts label, which states a food's sodium content. The following terms are also used on food packaging:
Food label term | Meaning |
---|---|
Sodium free | Less than 5 mg/serving |
Very low sodium | 35 mg or less/serving |
Low sodium | 140 mg or less/serving |
Reduced sodium | 25% reduction in sodium content from original product |
Unsalted, no salt added, without added salt | Processed without salt when salt normally would be used in processing |
RESOURCES
American Dietetic Association
www.eatright.org
The Nutrition Source
Harvard School of Public Health
http://www.hsph.harvard.edu/nutritionsource/
CANADIAN RESOURCES:
Canadian Council on Food and Nutrition
http://www.ccfn.ca/
Heart and Stroke Foundation of Canada
http://ww2.heartandstroke.ca/
References:
American Heart Association. Reading food labels. American Heart Association website. Available at: http://www.americanheart.org/presenter.jhtml?identifier=334. Updated March 18, 2009. Accessed June 14, 2010.
DynaMed Editorial Team. Hypertension. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what.php. Updated June 14, 2010. Accessed June 14, 2010.
Office of Technology Management at Chicago. Treatment method for salt-sensitive hypertension. Office of Technology Management at Chicago website. Available at: http://www.otm.uic.edu/node/75. Updated 2008. Accessed June 14, 2010.
Last reviewed June 2010 by Brian Randall, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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