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Apropos "Lo Salt": I use it to demonstrate natural radioactivity. Not only is KCl a favourite covert murder weapon, it's also radioactive!
Doesn't answer the obvious question, that if my blood pressure if excellent, should I still shy away from salt?I would say crisps, but most of the crisps have replaced salt with flavourings, so the salt content is way down on what it use to be.
Given a genetically matched pair, i.e. identical twins, why would one habitually consume significantly more salt, sugar, tobacco, alcohol, whatever.... than the other? If we exclude genetics, it must be environment. So who eats lots of snack foods and smokes a lot? My first guess would be the person with the most stressful life. Perhaps this can account for the anomalies of those heavy users who live to a ripe old age "against the odds".
No one knows why, but salt does appear to affect endothelial function (lining of blood vessels), which might be part of the reason.
Prolonged exposure to high plasma sodium concentrations i.e. >140mM induces a fluid shift from the interstitial to intravascular space by facilitating deterioration of the negatively-charged heparan sulphate moiety of the endothelial glycocalyx - thus upregulating Na entry into endothelial sodium channels.