Apart from this one: https://en.wikipedia.org/wiki/MARS-500
From : " "A reduction in salt intake led to a significant fall in blood pressure, even in the healthy volunteers," explains Jens Titze, from Erlangen-Nuremberg University." .. "Titze gradually reduced the daily salt intake of the 'cosmonauts' during the course of the world's longest metabolism study, while keeping all other nutrients unchanged."
But well, it's not something every study can do.
[] http://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10525/873...
Anyhow, to the above comment: http://nutritiondata.self.com/foods-000011000000000000000.ht...
Nutritional studies are worse than physiological studies. It's impossible to control for everything and just gets picked up but one side of the crazies or the other and like they will here just lead to a bunch of speculative anecdotal arguments.