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Low-Salt 'DASH' Diet Good for Total Heart Health

HealthDay News
by By Ernie Mundell and Robert Preidt HealthDay Reporters
Updated: May 25th 2021

new article illustration

TUESDAY, May 25, 2021 (HealthDay News) -- It's consistently rated high among diets for all-around health, and a new report finds the DASH diet is all-around good for your heart, too.

The Dietary Approaches to Stop Hypertension (DASH) regimen is designed to lower high blood pressure, but this new research shows that it also reduces inflammation, heart injury and strain.

The study provides "some of the strongest evidence that diet directly impacts cardiac damage, and our findings show that dietary interventions can improve cardiovascular risk factors in a relatively short time period," said study first and corresponding author Dr. Stephen Juraschek. He's assistant professor of medicine at Beth Israel Deaconess Medical Center (BIDMC) and Harvard Medical School, in Boston.

"The data reinforce the importance of a lifestyle that includes a reduced-sodium, DASH diet rich in fruits, vegetables and whole grains to minimize cardiac damage over time," Juraschek said in a BIDMC news release.

One nutritionist with no ties to the study agreed.

"The DASH diet is not just a diet low in salt," explained Nicole Roach, a registered dietitian at Lenox Hill Hospital in New York City. "Other aspects of the DASH diet include consuming fruits, vegetables, low-fat dairy products, whole grains, poultry, fish and nuts while limiting saturated fats, cholesterol, red meat, sweets and sugar-containing beverages."

In the Boston study, Juraschek's group analyzed blood samples from hundreds of clinical trial participants in the United States who followed the DASH diet or a diet designed to mimic a more typical (and less healthy) American diet. The focus was on three "biomarker" proteins found in blood that are associated with heart problems.

Among people on the DASH diet, biomarkers linked to cardiac damage and inflammation declined by 18% and 13%, respectively. Those who combined the DASH diet with reduced sodium intake had the greatest reductions in the biomarkers for cardiovascular injury and stress — 20% and 23%, respectively — but there was no significant effect on inflammation.

The DASH diet alone did not reduce the biomarker for stress, but that biomarker declined by 19% in those who followed low-sodium diets, whether they were on the DASH diet or the "control" diet.

Lowering salt intake alone did not have a beneficial impact on heart injury or inflammation, the researchers noted.

"Our study has important clinical implications, and these findings should strengthen public resolve for public policies that promote the DASH dietary pattern and lower sodium intake in the United States and globally," Juraschek said.

While heart disease remains the number one killer, Roach said there are "many factors which are considered to be modifiable that we can control, such as diet and lifestyle."

When it comes to dietary sodium, "the American Heart Association recommends no more than 2,300 milligrams [about a teaspoon] a day and an ideal limit of no more than 1,500 mg per day for most adults, especially for those with high blood pressure," she said.

Roach offered the following tips to help you cut back on salt in your diet:

  • Avoid salt when cooking. Try herbs and spices which can be bought as fresh or dry.
  • Avoid having the salt shaker at the kitchen table. This can help reduce desire to add salt to an already cooked meal.
  • Choose fresh food over canned, packaged and processed. If fresh is not an option, look for labels that say low sodium, no salt, zero salt, very low salt.
  • If buying canned food, dump into a pasta strainer and rinse with water.
  • When reading food labels, avoid foods with more than 300 mg of sodium per serving.

The new study was funded by the U.S. National Institutes of Health/National Heart, Lung, and Blood Institute and was published online May 24 in the Journal of the American College of Cardiology.

More information

The U.S. National Heart, Lung, and Blood Institute has more on the DASH diet.

SOURCES: Beth Israel Deaconess Medical Center, news release, May 24, 2021; Nicole Roach, RD, nutritionist, Lenox Hill Hospital, New York City