SALT, TROUBLE FOR BRAIN....?

Since yet Dr. used to think that salt is bad for heart but after having a research in Canada it came to know that  salt can be danger for brain too.Specially for those aged people who use a lot of salt in their food but they don't do exercises.Their brains can be dumb before in compare to those who use salt in a normal way and do body exercises daily. It was researched on 1262 people between the age 67 to 84 ,subject was Salt.Men and women both were included in this researched.
                                             Before starting the experiments their brain health were tested and after that during three years they were tested many times.In which it came to see that those people who were using salt at high level and didn't do any body exercises, their brains became infected.On the other hand those who used salt in a normal way and used to do body exercises were perfectly fine and they were like before the experiment.