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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 several minerals that are also electrolytes, whose primary function is to regulate fluid in your cells. The upper limit for sodium set by the Institute of Medicine is the equivalent of 1 teaspoon daily for healthy adults age 50 and under. Intake higher than this amount can result in adverse health effects, including the development of hypertension and increased risk for heart attack and stroke.