Also, there’s a warning label that says “consult a physician before using any salt substitute.” Is there any upper limit for a heathly adult? PPLP only has warnings for people on medication.

COMMENT from MD EADES: We use Morton’s Lite Salt ourselves, without worry. People who take certain potassium conserving medications (usually for blood pressure) and people with poorly functioning kidneys need to worry about getting too much, but the rest of us, usually not. Normal kidneys can handle a mild excess without undue strain.

http://www.nutritionandmetabolism.com/content/1/1/2

Loren Cordain in the Paleo Diet books seems to suggest the more potassium the better (which I doubt is his real opinion, but the books seem to suggest that).

COMMENT from MD EADES: More potassium is better and from my many conversations with Loren about the subject, I think that is his ‘real’ opinion.

PS, you were in the Junk folder again. I can’t figure out why. It may be that you preview your comment after typing in the code word and the act of previewing somehow undoes the code and you have to do it again. Better, just make it the last thing you do before you hit save.

COMMENT from MD EADES: Your wife is absolutely correct that the body must have iodine; it’s required for making thyroid hormone. Without enough of it, humans will develop a thyroid goiter, which they routinely did in bygone times in inland areas where there was no access to seafood (which contains iodine.) Goiter disappeared once the notion took hold of adding iodine to salt. So, iodized table salt is an easy to get, good source of iodine, but it can be had in shellfish and in vitamin/mineral supplements, too. One good compromise is using Morton’s Lite Salt, which is half iodized sald and half potassium chloride and will instantly cut sodium intake from salt by half and increase potassium at the same time.