Dietary guidelines often change, but “restrict your salt intake” has resisted the advances of science. The National Academy of Medicine recently reiterated its advice to limit daily sodium intake to 2,300 milligrams (a little over a teaspoon of salt), or 1,500 milligrams for those at risk of cardiovascular disease. An article last week in the New England Journal of Medicine endorsed that view and called for the Food and Drug Administration to impose voluntary sodium limits on 150 food categories. These recommendations ignore scientific developments and may be harmful to your health. In Marc...