Potassium Facts

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Potassium is the body's principal intracellular cation, inside the body cells. Potassium plays a major role in maintaining fluid and electrolyte balance and cell integrity.  Controlling potassium distribution is a high priority for the body because it affects many aspects of homestasis, including a steady heartbeat. Potassium rich fruits and vegetables also seem to reduce the risk of stroke. High potassium intakes along with lower sodium seem to correct hypertension.

Potassium Deficiency

Potassium is found in all living cells. Cells remain intact unless processed so the best sources of potassium are fresh foods not canned vegetables which will contain less potassium than your unprocessed fruits and vegetables. Most people need to have five to nine servings of fruits and vegetables daily to meet their daily requirements of potassium. A deficiency can lead to high blood pressure, salt sensitivity, kidney stones, and bone turnover. As it progresses symptoms might include irregular heartbeats, muscle weakness, and glucose intolerance.

Potassium Toxicity

Potassium toxicity does not occur from eating fruits or vegetables. It can happen by taking supplements or drinking too many energy fitness shakes. When the the body gets too much potassium the kidneys accelerate their excretion, if the GI tract is bypassed, the potassium is injected directly into a vein, where it could stop the heart.

Sources: 
Understanding Nutrition Eleventh Edition

Books on Potassium for further research.

Potassium supplements