If you are looking for a good summary about the recent scientific studies on salt and health, the New York Times editorial board says, “There is considerable evidence that lowering sodium can reduce blood pressure, but there is scant evidence that reducing blood pressure from levels that are not clearly high will necessarily reduce the risk of heart attacks, strokes and death.”
Previous studies have found little evidence to support those low recommended sodium targets. Now a large study by researchers at McMaster University in Ontario, Canada, which tracked more than 100,000 people from 17 countries on five continents, has found that the safest levels of sodium consumption are between 3,000 and 6,000 milligrams. Consumption below that level (but higher than our current targets) showed increased risk of death and cardiovascular events. Roughly 10 percent of the patients followed in the study fell below 3,000 milligrams, a sizable number to put at risk. Other studies have found that very low levels of sodium can disrupt biochemical systems that are essential to human health or trigger hormones that raise cardiovascular risk
Clearly the U.S. Department of Agriculture should reconsider how far to reduce salt content in school meals.