Potassium is very important to maintaining heartbeat. In a state of dehydration, sodium is lost along with water that is lost from the body, however more critical damage comes because potassium is lost from inside cells at the same time.
Potassium deficiency is dangerous because it affects the brain cells, making the person unaware of the need for water.
A lifelong consumption of foods that are low in sodium and high in potassium helps protect aganist high blood pressure.
A dietary deficiency of potassium is very unlikely, however high sodium diets that are also high in processed foods and also low in fruits and vegtables can make potassium deficiency is possible.
Potassium supplements should never be self-prescribed. Toxicity from potassium in supplement form is a greater concern than being deficient.
A few food sources of potassium: