(19-05-11) Eating Less Salt Doesn't Cut Heart Risks: Study

By Genevra Pittman

NEW YORK (Reuters Health) - People who ate lots of salt were not more likely
to get high blood pressure, and were less likely to die of heart disease than
those with a low salt intake, in a new European study.

The findings "certainly do not support the current recommendation to lower
salt intake in the general population," study author Dr. Jan Staessen, of the
University of Leuven in Belgium, told Reuters Health.

Current salt guidelines, including those released by the U.S. government in
January, are based on data from short-term studies of people who volunteered to
be assigned to a low-salt or high-salt diet, Staessen said.

The U.S. guidelines recommend that Americans consume less than 2,300
milligrams of salt daily - 1,500 mg in certain people who are more at risk for
high blood pressure or heart disease.

While previous trials suggested a blood pressure benefit with lower salt
intake, research has yet to show whether that translates into better overall
heart health in the wider population.

The researchers used data from two different studies, incorporating a total of
about 3,700 Europeans who had their salt consumption measured through urine
samples at the start of the studies. Staessen and his colleagues broke the
participants up into three groups: those with highest and lowest salt intakes,
and those with average intake.

None of the participants had heart disease at the outset, and two thirds had
normal blood pressure. They were followed for an average of 8 years, during
which researchers determined how many of them were diagnosed with heart
disease, and in a smaller group, how many got high blood pressure.

The findings are published in the Journal of the American Medical Association
(JAMA).

The chance of getting heart and blood vessel diseases did not differ in the
three groups. However, participants with the lowest salt intake had the highest
rate of death from heart disease during the follow up (4 percent), and people
who ate the most salt had the lowest (less than 1 percent).

Across all three salt-intake groups, about one in four study participants who
started out with normal blood pressure were diagnosed with high blood pressure
during follow up.

The researchers did find that one measure of blood pressure, systolic blood
pressure, increased as salt intake increased over time - but the change was
very small, so it may not be important to health outcomes, Staessen said.

Reducing salt may still be a good idea for people who already have high blood
pressure or who have had heart problems in the past, he added, but the study
found no evidence that dietary salt causes those conditions to arise.

"It's clear that one should be very careful in advocating generalized
reduction in sodium intake in the population at large," Staessen said. "There
might be some benefits, but there might also be some adverse effects."

Dr. Hillel Cohen, an epidemiologist at the Albert Einstein College of Medicine
in New York, told Reuters Health that when restaurants or food companies put
less salt in their products, they may put in other potentially harmful products
to make up for the lost taste, or as preservatives.

Consumers shouldn't change their salt-eating behavior based on the limited
studies that have tried to determine the link between sodium and heart risks,
added Cohen, who was not involved in the current research.

The authors caution that their analysis included only white Europeans, and so
the results may not translate to people of other ethnicities.

SOURCE: http://bit.ly/hwxtTL JAMA, online May 3, 2011.

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In evidenza

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