Here we go

Has anyone seen any research on a question that seems it MUST have been studied? While human societies have been consuming the same amount of salt per person for more than a century, advocates of reducing dietary sodium suggest substituting low-salt products for their regular-salt counterparts can be an important strategy to reduce overall salt intakes. But is it so? Has anyone seen any research showing that individuals who choose low-sodium diets consume less total salt? I raised this question in a letter to the British Food Standards Agency a week ago; no answer yet from them. How about someone else?