Can eating too much salt cause depression?
Too much salt will usually cause strokes and heart problems and high blood pressure. On the other side too little can cause problems as well.
Most foods contain enough salt to meet the needs of the body, but people, out of habit, use more than they need.
I must admit I use more than I should and I do have a minor heart problem, but I do not worry about it as I am more concerned about using salt as a cleaning/sterilizing agent.
It will not cause depression. It will cause the problems I said above and if you are inclined to worry too much about your risk of stroke or heart problems, then you can get a little down or low mood as they seem to call it now.