That's not always the case. In fact, sometimes the reverse of that is true. It's really on a case-by-case basis.
One thing I can say is that the Finnish government did a study looking at sodium levels in food. They found that when a diet consisted mostly of fresh fruits and vegetables and homemade foods, in some cases it was difficult to get enough sodium in the diet to hit that kind of adequate intake—which a lot of scientists think is too high anyway.
It's really the processed food that presents the problem, and part of that problem is created by our palates adjusting to salty food. We like the taste of salty food because that's what we eat.
They are noticing in the United Kingdom that as the salt levels are coming down, when people taste salty food they don't like the taste of it; it is repulsive to them.