Salt (sodium) is vital for
Sodium is vital for many biological functions including carrying nutrients across the cell membrane. Sodium deficiency is usually indicative of an adrenal issue since the adrenals (mineralcorticoids) control sodium/potassium utilization.
Remember that potassium is the opposite of sodium, so if you uptake sodium without potassium, usually it will not hold and vice versa.
Sodium and potassium are major constituents of the nervous system, so deficiencies of either will cause depression, paranoia or fears, etc etc. I understand that many antidepressants work by forcing the sodium ion. It is also believed that lithium works by modulating the sodium/potassium ions since they are in the same row or column on the periodic table of elements.
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Adrenal stress is caused by the immune system overreaction and by toxin overloads. Don't forget magnesium as the master mineral, it is vital. Pantothenic acid, vitamin C, vitamins B2 and B6 (plus other nutrients) are vital for adrenal health.