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Sodium is an essential mineral for the human body. The most common form of sodium is table salt (sodium chloride). As an added ingredient to most foods - used for curing meat, masking off-flavors, retaining moisture, and enhancing flavors - sodium is typically over-consumed in very high amounts in modern society.
Sodium is a positively charged ion and loss of potassium within the blood causes a compensatory reabsorption of sodium in the proximal tubules of the kidneys. Sodium is the dominant extracellular cation and cannot freely cross the cell membrane.