How does potassium work in your body?
This article will cover everything you need to know about the essential nutrient potassium, including its benefits, sources, and recommended intake. We will also dispel some common myths about potassium and answer some frequently asked questions. Whether you want to improve your diet or simply learn more about this important nutrient, read on!
What is potassium?
Potassium (K) is an essential mineral found in all living organisms, including vegetables, fruits, and meat. It plays many important roles in the body, including helping to maintain water levels in cells and sending messages from the brain to help regulate heart rate. Potassium also helps transmit nerve impulses and contract muscles. Without enough potassium in your body, you may feel tired, confused, and weak because your muscles will not be able to perform their tasks properly.
What are the benefits of potassium?
Potassium plays an important role in many aspects of our health, so it is important to get enough of it every day. Here are just a few ways potassium can help you:
- Reduces the risk of heart disease and stroke: Eating potassium-rich fruits and vegetables can help reduce the risk of cardiovascular diseases such as heart attack and stroke. Consuming this mineral can also lower blood pressure, which is a major risk factor for both heart disease and stroke.
- Helps maintain normal blood pressure: Consuming enough potassium can help balance the effects of sodium on blood pressure, which can reduce the risk of hypertension over time. Therefore, it is important to include plenty of potassium-rich foods in your diet while avoiding excess sodium.
- Good for your bones: Potassium is essential for maintaining bone health. This mineral also helps activate vitamin D, which is important for calcium absorption in the bones.
- Supports digestive health: Eating a potassium-rich diet can help reduce the risk of gastrointestinal diseases such as ulcers and inflammation by helping to relieve stress on the stomach lining. The mineral also aids in proper bowel movements by helping to release bile from the gallbladder and aiding in the absorption of nutrients in the intestines.
- Maintains healthy skin: A diet rich in potassium can help reduce acne and improve skin hydration by balancing the effects of sodium in the body. This is because high sodium levels cause dehydration, leading to dry skin that becomes cracked and inflamed when rubbed.
- Supports proper nerve function: Potassium helps send messages from the brain to the rest of the body, so it is important for maintaining healthy nerves. This mineral also plays a role in muscle contractions and transmits information between cells.
What are the best sources of potassium?
There are many foods you can eat to get enough potassium in your diet. Here are just a few:
- Bananas - One medium banana contains 9% of the recommended daily intake (RDI) of potassium, or 1,037 milligrams (mg). This fruit also provides over 13% of the daily value (DV) of vitamin C, which helps maintain healthy bones and collagen production in the skin.
- Spinach - One cup of cooked spinach contains 6% of the RDI for potassium, or 896 mg. This green also provides over 15% of the daily requirement for vitamin A, which helps maintain healthy skin and eyes.
- Potatoes - One large potato contains 9% of the RDI for potassium, or 1008 mg. It also provides about 3% of the DV for iron, which helps reduce fatigue. Tomatoes - One medium tomato contains 5% of the RDI for potassium, or 726 mg. It also provides over 13% of the daily requirement for vitamin C, which helps maintain healthy bones and skin by boosting collagen production in the body.
Too much potassium
Too much potassium can be harmful to you, right?
Many people believe that excess potassium in the body is just as dangerous as excess salt. But this is not necessarily true. In fact, most people do not get enough potassium in their diet because they avoid fruits and vegetables rich in this mineral. The truth is that most healthy people can eat a variety of potassium-rich foods without worrying about getting too much. If you are concerned about your potassium intake, talk to your doctor about having a blood test to determine how much of this mineral is in your body.
What are the side effects of too much potassium?
Too much potassium can cause dehydration, leading to low blood pressure and an increased risk of fainting or heart attack. Nausea, vomiting, abdominal cramps, and bloating may also occur. This can happen if you take potassium supplements while also getting potassium through your daily diet.
Too much potassium can also cause arrhythmia, which is a condition that affects your heartbeat. In this case, your heart may beat too fast or too slow and lead to heart failure if not properly cared for. Arrhythmia is most common in people with chronic kidney disease and those taking diuretic medication.

The combination of potassium and magnesium
Magnesium and potassium are two essential minerals that work together in the body to maintain normal function. Both minerals are involved in electrolyte balance and muscle function, and they also work together to support cardiovascular health. Magnesium is also essential for energy production, and potassium is essential for nerve and cell function. Together, these two minerals are important for overall health and well-being.
How the body uses magnesium and potassium
Magnesium is a mineral that works with many enzymes in the body to help break down food, maintain proper muscle and heart function, and aid in the transmission of electrical impulses through the nerves. Potassium helps regulate blood pressure and aids in energy production in cells. Together, these two minerals are essential for creating cellular energy and maintaining electrolyte balance in the body. Without them, our muscles would quickly tire from intense activity, and our hearts would struggle to pump blood to the rest of the body.
Magnesium and potassium also work together to maintain healthy nerve function. Nerves transmit electrical impulses through cells, and magnesium helps activate these impulses, while potassium helps maintain the integrity of the cell membrane. Without adequate levels of both minerals, nerve function would be impaired and significant pain would occur throughout the body. Magnesium is essential for the formation of DNA and RNA in the body and works with many enzymes that break down food into useful nutrients. Potassium helps maintain fluid balance and helps regulate blood pressure. Together, these two minerals are essential for maintaining proper cell function and cardiovascular health.
Foods rich in magnesium and potassium
There are many foods that contain both magnesium and potassium. Some of these include:
- spinach
- chard
- kidney beans
- white beans
Other foods rich in magnesium and potassium include:
- orange juice
- yoghurt
- bananas
- cantaloupe melon.
When choosing a fruit or vegetable high in both minerals, look for ones that are unprocessed and unpreserved. These foods may contain unnecessary additives and extra sugar, which can increase the amount of magnesium lost in the body. If you do not consume dairy products, look for calcium-rich alternatives such as beans, spinach, and Swiss chard.
Bibliography
‘Minerals essential in the daily diet’, Jopp Andreas, Vital, 2018.
‘Vitamins and Minerals’, Janusz Dąbrowski, Adamascenium, 2017.
‘Human Nutrition’, collective work, PWN, 2022.