Potassium’s role in the body: Potassium is the major mineral element in body cells. It plays an important role in electrolyte balance, nerve conduction and muscle contraction, beating of the heart, energy production and protein synthesis. It also helps neutralize sodium's tendency to raise blood pressure. It may lower the risk of death from stroke.

RDA: 1950-5460 mg, or 50-140 mmol (1 millimole/mmol = 39mg)

Toxicity: Potassium toxicity is rare in healthy people. Over 250 mmol (approximately 10g) may cause cardiac arrest. Toxicity is more likely with kidney, heart or liver disease.

Deficiency: More common in persons on diuretic drugs who suffer from prolonged vomiting and diarrhea. Symptoms of potassium deficiency include muscular weakness, apathy, confusion and an abnormal heartbeat.

Good food sources: Potassium is found in all animal and plant cells.