Indeed, research doesn't always support the notion that salt causes high blood pressure: A large, multicenter study known as INTERSALT compared urinary sodium levels — an accurate indicator of
prior sodium consumption — with hypertension in more than 10,000 people in 1988 and found no statistically significant association between them.
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.