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  • Writer's pictureWendy@wendysfitness4life



Potassium is a mineral which has several important functions in the body, largely regulating fluid levels and nerve and muscle function, including regulating heart rhythm. It is normally possible to get all the potassium we require through a healthy diet as it occurs naturally in many foods.

Why do we need potassium?

Potassium has many important roles within the body. It is found in all cells in the body, and levels are regulated by the kidneys. It works alongside sodium to maintain a normal blood pressure. Potassium is known as an electrolyte, and this helps to maintain a healthy balance of fluids in the body. It also helps to transmit electrical pulses to allow for proper nerve and muscle function.

Bone health is maintained with calcium and phosphorous, and it is potassium which regulates the levels of these two minerals. This means that potassium is also essential for strong and healthy bones

Natural sources of potassium

As potassium is present in almost all fruit, vegetables, meat and fish, it should not be difficult to get all the potassium we need through a healthy and balanced diet. Adults need approximately 3,500 mg of potassium daily.

Foods rich in potassium include

·       1 large Sweet potato has 694mg

·       1 Medium Jacket Potato has 610mg

·       100g Chicken has 450mg

·       1 medium banana has 422mg

·       1 large Tomato has 300mg

·       1 Kiwi Has 240mg

·       1 orange has 237mg


Potassium deficiency

Potassium deficiency is not uncommon, but it often eludes diagnosis. It can have few symptoms to begin with, though mild symptoms of muscle weakness, fatigue, constipation and faintness. It is most common among the elderly, whose kidneys struggle to regulate potassium levels, those on diuretics, or those with eating disorders, such as bulimia.

Potassium deficiency is usually easily corrected by restoring a normal level of potassium into the diet. In particularly severe cases, or in those with complex liver conditions, complications may develop, such as abnormal heart rhythms.


Too much potassium

Normally, if too much potassium is consumed, the kidneys filter it out and it is excreted in the urine, stool or sweat. However, if the kidneys are not as effective at filtering, the excess levels of potassium can accumulate in the body. Too much potassium is called Hyperkalaemia. Initial symptoms of Hyperkalaemia include abdominal cramps, muscle weakness and irritability. Eventually it can lead to inhibition of muscle regulation, and in particular heart problems. 

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