Scientific American: It's time to end the war on Salt

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    Sep 26, 2011 2:44 PM GMT

    The zealous drive by politicians to limit our salt intake has little basis in science

    For decades, policy makers have tried and failed to get Americans to eat less salt. In April 2010 the Institute of Medicine urged the U.S. Food and Drug Administration to regulate the amount of salt that food manufacturers put into products; New York City Mayor Michael Bloomberg has already convinced 16 companies to do so voluntarily. But if the U.S. does conquer salt, what will we gain? Bland french fries, for sure. But a healthy nation? Not necessarily.

    This week a meta-analysis of seven studies involving a total of 6,250 subjects in the American Journal of Hypertension found no strong evidence that cutting salt intake reduces the risk for heart attacks, strokes or death in people with normal or high blood pressure. In May European researchers publishing in the Journal of the American Medical Association reported that the less sodium that study subjects excreted in their urine—an excellent measure of prior consumption—the greater their risk was of dying from heart disease. These findings call into question the common wisdom that excess salt is bad for you, but the evidence linking salt to heart disease has always been tenuous.

    Fears over salt first surfaced more than a century ago. In 1904 French doctors reported that six of their subjects who had high blood pressure—a known risk factor for heart disease—were salt fiends. Worries escalated in the 1970s when Brookhaven National Laboratory's Lewis Dahl claimed that he had "unequivocal" evidence that salt causes hypertension: he induced high blood pressure in rats by feeding them the human equivalent of 500 grams of sodium a day. (Today the average American consumes 3.4 grams of sodium, or 8.5 grams of salt, a day.)

    Dahl also discovered population trends that continue to be cited as strong evidence of a link between salt intake and high blood pressure. People living in countries with a high salt consumption—such as Japan—also tend to have high blood pressure and more strokes. But as a paper pointed out several years later in the American Journal of Hypertension, scientists had little luck finding such associations when they compared sodium intakes within populations, which suggested that genetics or other cultural factors might be the culprit. Nevertheless, in 1977 the U.S. Senate’s Select Committee on Nutrition and Human Needs released a report recommending that Americans cut their salt intake by 50 to 85 percent, based largely on Dahl's work.

    Scientific tools have become much more precise since then, but the correlation between salt intake and poor health has remained tenuous. Intersalt, a large study published in 1988, compared sodium intake with blood pressure in subjects from 52 international research centers and found no relationship between sodium intake and the prevalence of hypertension. In fact, the population that ate the most salt, about 14 grams a day, had a lower median blood pressure than the population that ate the least, about 7.2 grams a day. In 2004 the Cochrane Collaboration, an international, independent, not-for-profit health care research organization funded in part by the U.S. Department of Health and Human Services, published a review of 11 salt-reduction trials. Over the long-term, low-salt diets, compared to normal diets, decreased systolic blood pressure (the top number in the blood pressure ratio) in healthy people by 1.1 millimeters of mercury (mmHg) and diastolic blood pressure (the bottom number) by 0.6 mmHg. That is like going from 120/80 to 119/79. The review concluded that "intensive interventions, unsuited to primary care or population prevention programs, provide only minimal reductions in blood pressure during long-term trials." A 2003 Cochrane review of 57 shorter-term trials similarly concluded that "there is little evidence for long-term benefit from reducing salt intake."
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    Sep 26, 2011 7:08 PM GMT
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    Sep 26, 2011 7:26 PM GMT
    tl;dr excess salt in your diet might not cause heart disease
  • commoncoll

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    Sep 26, 2011 7:31 PM GMT
    Sweet article. Thanks for letting us know about it.
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    Sep 27, 2011 2:28 AM GMT
    think i've been told kidneys have a big role in whether salt will be bad or not bad for you .
  • Artesin

    Posts: 482

    Oct 06, 2011 4:58 AM GMT
    Yet again the key is moderation paired with limiting refinement.... I swear scientists dont have anything better to do, so they come out with studies that should have been common sense.

    Himalayan pink salt anyone >.
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    Oct 07, 2011 1:30 AM GMT
    The whole salt furor demonstrates how a variety of forces (the need for academic scientists to publish; the need for publications to have dramatic headlines; the public's need to be outraged about something; people's desire for simple explanations regarding complex systems) have undermined the credibility of health authorities.

    It's hard to think of any kind of food which has not been touted as beneficial and decried as damaging in the last sixty years. You could post a thread here saying some food was the best damn thing ever eaten and people would come out of the woodwork with testimony about how it cured their neuralgia--or how giving it up made them a raging sex god.

    One way or another, everything we eat does us some kind of harm.
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    Oct 07, 2011 12:59 PM GMT
    The salt industry must be failing, and using some of their advertising dollars to pay researchers to skew their research to persuade people to buy more salt.
  • iamhman

    Posts: 24

    Oct 07, 2011 1:21 PM GMT
    I appreciate this post.
    Americans are so unhealthy.
    The focus of diet should be on
    weight control, proportion control
    and healthier choices.
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    Oct 07, 2011 1:37 PM GMT
    thank you for this article, i have been saying this for long as moderation is used.. egg yolks are another misnomer...