There is evidence to show that the healthiest people are those who get 4-6 g of sodium a day. That translates to 10-15 g/day of sodium chloride (table salt). Also, the kidneys excrete sodium more readily, once insulin has dropped and no longer interferes with sodium excretion. So the symptoms called loosely the keto or Atkins “flu” are actually symptoms of low sodium. Constipation is also a symptom of low sodium.
If you find yourself experiencing any of these symptoms, a bit of extra salt should take care of them. When sodium intake is right, the body can more easily regulate the other minerals (calcium, magnesium, and potassium), since the mechanisms that regulate them are all interlinked.