Apparently it's in their genes , because it appears that historically, doctors have always been confused on this issue, and they have traditionally refused to recognize that diet can be a cause of disease. Ever since Hippocrates (arguably the Father of medicine) said, "Let food be thy medicine and medicine be thy food", it seems that every other doctor in the world has been insisting that he was wrong. And they don't seem to be inclined to ever change this long-held position. The article at the following link illustrates how this was the case approximately a hundred years ago, when pellagra was a major problem. It's déjà vu all over again, with today's autoimmune type disease "epidemic".
Pellagra and the Four Ds
Incidentally, if you will scroll down that page, you will find a very, very interesting article titled The Sodium Story. It sort of debunks the current myth that we should be continually reducing our salt intake to ridiculously-low levels
TexBottom line. For the average healthy person, be assured that your current sodium intake is probably OK. The U.S. average of about 3450 mg sodium per day is just above the point where the rescue mechanisms begin to kick in. So it’s not too much by any means. On the other hand, an intake of 6000 mg/day or higher can increase your risk of developing high blood pressure. So 6000 is too much. If you have a medical condition and are under the care of a physician who has recommended reduced sodium intake, take his/her advice; you’re paying for it. But, in view of the new IOM statement that there is no evidence of benefit for intakes below 2300 mg sodium per day, you might wish to ask your physician whether he/she is aware of the change and seek reassurance that continuing on a low salt diet is actually right for you.