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An otherwise healthy diet isn't going to offset damage to your heart from too much salt, a new study suggests.
Our latest findings show that the adverse relation of salt intake to blood pressure is not counteracted or reduced by other nutrients consumed, including about 80 that we assessed," said researcher Queenie Chan.
High-salt diets lead to high blood pressure, a major cause of heart disease and stroke, the researchers pointed out.
The association recommends adults consume no more than one teaspoon of salt -- about 2,300 milligrams (mg) of sodium -- a day in total. And most adults would do better with 1,500 mg daily, the group advises.
But one can of soup alone can have as much as 1,800 mg of sodium, experts have warned. Commercially made breads and rolls, cold cuts, cheese, and savory snacks like chips, crackers, and pretzels are other high-sodium foods.
This new study finds that salt's adverse effects on blood pressure cannot be blunted by augmenting the diet with fruits, vegetables and other nutrients, Chan said.
If a frozen pizza, chicken pot pie, or a ham and cheese sandwich contains 1,340 mg of salt, then that is the amount your body has to manage, whether you try to dilute it or not, Heller explained.
One solution to reducing salt intake, she said, is to read nutrition labels on foods and make more foods fresh at home.
"This can be done with a bit of forethought and planning and, ultimately, will help save money, too," Heller said.
To help lower high blood pressure, she recommends potassium-rich meal plans like the DASH diet, or Dietary Approaches to Stop Hypertension.
Potassium works with sodium to help maintain the body's fluid and electrolyte balance, she said. This new study found that at lower levels of 24-hour sodium excretion, potassium intake mitigated the sodium-blood pressure relation, but not at higher levels.
"A diet high in salt indicates that the diet is high in ultra-processed foods like hot dogs, frozen pizza, fast and junk foods like chips, commercially baked products, such as breads and prepared foods, and low in potassium-rich vegetables, fruits, legumes and grains," Heller said.
For the study, Chan and colleagues looked at data on salt consumption and the consumption of 80 nutrients, including proteins, fats, vitamins, minerals and amino acids. All might affect blood pressure, the researchers said.
Also included in the review were data on urine levels of salt and potassium.
The study population was made up of more than 4,600 women and men aged 40 to 59 in the United States, the United Kingdom, Japan and China.