Lynn L. Moore, DSc, associate professor of medicine at Boston University School of Medicine, will present the new research at the American Society for Nutrition Scientific Sessions and annual meeting during the Experimental Biology 2017 meeting, to be held April 22-26 in Chicago.
“We saw no evidence that a diet lower in sodium had any long-term beneficial effects on blood pressure,” said Moore. “Our findings add to growing evidence that current recommendations for sodium intake may be misguided.”
The 2015-2020 Dietary Guidelines for Americans recommends limiting sodium intake to 2,300 milligrams a day for healthy people. For the study, the researchers followed 2,632 men and women ages 30 to 64 years old who were part of the Framingham Offspring Study. The participants had normal blood pressure at the study’s start. However, over the next 16 years, the researchers found that the study participants who consumed less than 2,500 milligrams of sodium a day had higher blood pressure than participants who consumed higher amounts of sodium.
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Other large studies published in the past few years have found what researchers call a J-shaped relationship between sodium and cardiovascular risk — that means people with low-sodium diets (as recommended by the Dietary Guidelines for Americans) and people with a very high sodium intake (above the usual intake of the average American) had higher risks of heart disease. Those with the lowest risk had sodium intakes in the middle, which is the range consumed by most Americans.
“Our new results support these other studies that have questioned the wisdom of low dietary sodium intakes in the general population,” said Moore.