How can implementing a population-wide salt-reduction program be so hard?
For most of human evolution, the average daily diet contained a fraction of a gram of salt and our physiology developed accordingly.1 A few thousand years ago, with the discovery that salt could preserve food, average intake started to rise. Now, with salt poured into the food supply, average Australian consumption levels are many times our physiological need.2 Populations eating the level of salt upon which we evolved are now few, but they provide a window into normal physiological processes. One of the most notable findings is that their blood pressure levels do not rise with age.3
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