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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 one of the body's electrolytes, which are minerals that the body needs in relatively large amounts. Electrolytes carry an electric charge when dissolved in body fluids such as blood. Most of the bodyâs sodium is located in blood and in the fluid around cells. Sodium helps the body keep fluids in a normal balance (see About Body Water). Sodium plays a key role in normal nerve and muscle function. The body obtains sodium through food and drink and loses it primarily in sweat and urine.