Sodium is considered the most abundant extracellular cation, which is extremely important for maintaining the membrane potential and consequently conducting nerve impulses and muscle contraction. It is also important in the process of maintaining osmotic pressure.
In The Food
Sodium is found in most of the food we consume, but we get it mostly from the consumption of sodium chloride, i.e. common table salt. It is estimated that 75% of the sodium we consume comes from processed food due to the addition of salt to it during the production process.
Sodium deficiency or hyponatremia occurs due to increased fluid retention or increased sodium loss, while hypernatremia (increased sodium levels in the blood) rarely occurs due to excessive sodium intake, but the primary cause is a lack of water in the body.