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Getting to the Heart of a Healthful Diet: Sodium

by Karen Schroeder, MS, RD
Beliefnet


Salt shakerAmerican Heart Association recommendation: Eat less than 6 grams of salt (sodium chloride) per day (2400 milligrams of sodium). Here's why:

Sodium intake may be a primary factor in the development of high blood pressure (hypertension), which is a major risk factor for heart attack.

About half of those with hypertension and 30% of the general public are described as "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 intakes (to 2400 mg/day) 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 2400 mg/day.