posted April 22, 2006 02:38 PM              

Here’s what scientists have found:
1. An eight-year study of a New York City hypertensive population stratified for sodium intake levels found those on low-salt diets had more than four times as many heart attacks as those on normal-sodium diets – the exact opposite of what the “salt hypothesis” would have predicted. (1995)

2. An analysis by NHLBI’s Dr. Cutler of the first six years’ data from the MRFIT database documented no health outcomes benefits of lower-sodium diets. (1997)

3. A ten-year follow-up study to the huge Scottish Heart Health Study found no improved health outcomes for those on low-salt diets. (1997)

4. An analysis of the health outcomes over twenty years from those in the massive US National Health and Nutrition Examination Survey (NHANES I) documented a 20% greater incidence of heart attacks among those on low-salt diets compared to normal-salt diets (1998)

5. A health outcomes study in Finland, reported to the American Heart Association that no health benefits could be identified and concluded “…our results do not support the recommendations for entire populations to reduce dietary sodium intake to prevent coronary heart disease.” (1998)

6. A further analysis of the MRFIT database, this time using fourteen years’ data, confirmed no improved health benefit from low-sodium diets. Its author conceded that there is "no relationship observed between dietary sodium and mortality." (1999)

7. A study of Americans found that less sodium-dense diets did reduce the cardiovascular mortality of one population sub-set, overweight men – the article reporting the findings did not explain why this obese group actually consumed less sodium than normal-weight individuals in the study. (1999)

8. A Finnish study reported an increase in cardiovascular events for obese men (but not women or normal-weight individuals of either gender) – the article, however, failed to adjust for potassium intake levels which many researchers consider a key associated variable. (2001)

9. In September, 2002, the latest and highest-quality meta-analysis of clinical trials was published in the British Medical Journal confirming earlier meta-analyses' conclusions that significant salt reduction would lead to very small blood pressure changes in sensitive populations and no health benefits. (2002)

Controversy Continues
For many years, the intense public controversy that has characterized the public policy debate over public health nutrition recommendations on salt intake has focused on the wrong question. Medical experts, public health policy-makers – and the public, trying to sort out the issues reading the consumer press – have all focused on the relationship of sodium intake to blood pressure instead of the relevant question of whether changing intake levels of dietary sodium results in improved health outcomes. See, for example, recent Salt Institute comments to the (British) Scientific Advisory Committee on Nutrition.

There is no evidence that reducing dietary sodium improves the risk for heart attacks or strokes for the general population. In 1999, the Canadian Hypertension Society, the Canadian Coalition for High Blood Pressure Prevention and Control, the Health Canada Laboratory Centre for Disease Control and the Heart and Stroke Foundation of Canada issued a joint statement opposing general recommendations for sodium reduction.

The U.S. Preventive Services Task Force has also reviewed the evidence and concluded:
"There is insufficient evidence that, for the general population, reducing dietary sodium intake or increasing dietary intake of iron, beta-carotene, or other antioxidants results in improved health outcomes."

The debate has confused the public. Medical journalists from ABC-TV’s 20/20 to America’s pre-eminent scientific journal, Science, published by the prestigious American Association for the Advancement of Science, have investigated the source of this confusion. The report in Science won author Gary Taubes a top prize from the National Association of Science Writers and has also been translated into French.

Taubes concluded:
“After interviews with some 80 researchers, clinicians, and administrators around the world, it is safe to say that if ever there were a controversy over the interpretation of scientific data, this is it….After decades of intensive research, the apparent benefits of avoiding salt have only diminished. This suggests either that the true benefit has now been revealed and is indeed small or that it is non-existent and researchers believing they have detected such benefits have been deluded by the confounding of other variables.”

posted April 23, 2006 04:01 AM              

i love salt...a wonderful, earthy, watery, cleansing, magical substance...