Salt restriction is a tool for lowering the blood pressure,
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This is why dietary salt restriction causes only a small blood pressure reduction even in someone with hypertension.
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"I think for the general population, salt restriction is not a very wise thing to push, " she says.
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"And if they pick the salt restriction, they'll get a very minor benefit, in my opinion ."
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The first DASH trial, reported in The New England Journal of Medicine in April 1997, struck a blow for relaxing salt restrictions.
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But with the second DASH study, published last week in The New England Journal of Medicine, salt restriction has roared back into the picture.
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Changing to a DASH diet lowered their pressure substantially more, by 5.9 / 2.8, without any salt restriction at all.
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The American Heart Association, like most health organizations, supports a modest salt restriction to 2, 400 milligrams of sodium a day for everyone.
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"This shows that even the DASH diet doesn't make salt restriction irrelevant, " the study's leader, Sacks said.
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A sequel to the national study will get under way soon to see if adding salt restriction to the test diet will yield an additional blood pressuring-lowering benefit.
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