High salt diet is prevalent in our society these days. Even if you are trying to eat a low salt diet sodium is hidden in most prepackaged foods.

Why would this happen? because salt and sugar act like a preservative keeping food shelf stable longer and yielding higher profits for those companies that make prepackaged foods.

Pub Med which is the
US National Library of Medicine National Institutes of Health- found that a high salt diet causes a excretion of potassium the more salt you have the more potassium you lose in the urinary tract, as always in the body and nature its all about balance sodium and potassium work like a seesaw one goes down one comes up and body likes to have a balance to have both.

The loss of potassium is linked to bronchial symptoms of wheezing and shortness of breath, and because sodium (salt) causes this it is the high salt diet that is the culprit.

https://www.ncbi.nlm.nih.gov/pubmed/8491301 follow the link to pubmed for the full article.