Most healthy people do not need electrolyte drinks. A varied diet supplies sodium, potassium and other electrolytes, and the average adult already eats about twice the WHO sodium limit. Electrolyte drinks are useful mainly during vomiting or diarrhoea and for long or very sweaty exercise; otherwise water and balanced meals are enough.
Key takeaways
- Electrolytes such as sodium, potassium and magnesium control fluid balance, nerves and muscles.
- Average sodium intake is about 4,278 mg a day, more than double the WHO limit of 2,000 mg.
- Potassium mostly comes from vegetables, fruit and pulses; about 3,510 mg a day may be beneficial.
- Oral rehydration solutions help with vomiting and diarrhoea; sports drinks suit long, sweaty exercise.
- People with kidney, heart or blood pressure conditions should ask a doctor before using electrolyte products.
What are electrolytes?
Electrolytes are minerals that carry an electrical charge when dissolved in body fluids. The main ones are sodium, potassium, chloride, magnesium, calcium and bicarbonate. Together they help control how much water sits inside and outside your cells, keep nerves firing and muscles contracting, and support a normal heart rhythm. Your kidneys keep their levels in a narrow range by holding on to or getting rid of them as needed.
That last point matters: in a healthy person, the body is very good at balancing electrolytes on its own, as long as you eat a varied diet and drink when you are thirsty.
| Electrolyte | Main roles | Common food sources |
|---|---|---|
| Sodium | Fluid balance, nerve and muscle function | Salt, bread, cheese, processed meats, sauces, ready meals |
| Potassium | Fluid balance, muscle and heart function, blood pressure | Vegetables, fruit, beans, lentils, potatoes, yogurt |
| Chloride | Fluid balance, stomach acid | Mostly from salt (sodium chloride) |
| Magnesium | Muscle and nerve function, energy metabolism | Nuts, seeds, whole grains, legumes, leafy greens |
| Calcium | Bones, muscle contraction, nerve signalling | Milk, yogurt, cheese, fortified plant milks, tofu set with calcium |
Do most people need extra electrolytes?
For sodium, the answer is almost always no. The WHO recommends that adults have less than 2,000 mg of sodium a day, which is under 5 g of salt, or just under a teaspoon. In 2021 the global average was about 4,278 mg of sodium a day, roughly 11 g of salt, more than double the recommendation. Much of it comes from bread, processed meats, snack foods, cheese and condiments such as soy and fish sauce, not just the salt shaker. Our guide to salt and sodium limits goes into detail.
Potassium is the opposite story. The WHO healthy diet fact sheet notes that about 3,510 mg of potassium a day may be beneficial for adults, and the best way to get it is from vegetables, fruit, beans and lentils, not a supplement. See why potassium matters for food examples.
In other words, most people would benefit from fewer salty processed foods and more plants, not from an electrolyte drink.
When can electrolyte drinks help?
There are situations where you lose more fluid and minerals than usual and replacing them deliberately makes sense.
Vomiting and diarrhoea
This is the clearest case. The NHS lists vomiting and diarrhoea among the main causes of dehydration and says a pharmacist can recommend oral rehydration solutions: powders you mix with water that replace both fluid and salts. Babies, young children and older adults are at higher risk and need closer attention.
Long or very sweaty exercise
Heavy sweating during exercise, especially in hot weather, is also a recognised cause of dehydration. Sweat contains sodium as well as water. For a typical 30–60-minute workout, water and your next meal are usually enough. For long sessions, endurance events or training in the heat, a drink or food that includes sodium, and often carbohydrate, can help. Our guide on what to eat after a workout covers recovery meals.
Hot weather and illness with fever
Heat exposure and a high temperature both raise fluid needs. Drinking regularly and eating normal meals usually covers electrolytes too; a salty soup such as a lentil soup plus water can be enough for many adults. Salted yogurt drinks such as ayran or lassi also provide fluid and some sodium, but remember that they count towards your daily salt if you are watching your blood pressure.
What should you watch for in electrolyte drinks?
Electrolyte products range from rehydration sachets to sports drinks, tablets and flavoured powders. Before you make them a daily habit, check three things on the label:
- Sugar and calories. Many sports drinks are sweetened. That carbohydrate is useful during long exercise, but in everyday life it is a source of liquid calories and free sugars. The WHO advises keeping free sugars under 10% of energy, about 50 g a day on a 2,000-calorie diet.
- Sodium. If you already eat more than 2,000 mg a day, adding salty drinks moves you further from the WHO limit. This matters most for people with high blood pressure.
- Who it is for. Oral rehydration solutions are designed for illness; sports drinks for exercise. They are not interchangeable, and a pharmacist can advise which suits you.
If you log what you drink in Sporty, sugary sports drinks show up in your daily calories like any other food, which makes them easier to judge. For everyday hydration, water remains the default; see how much water to drink per day.
What are signs that you are low on fluids?
The NHS lists these common signs of dehydration in adults and children:
- feeling thirsty, dizzy or light-headed
- a headache or feeling tired
- dark yellow urine or peeing less often
- a dry mouth, lips and tongue, and sunken eyes
Usually, drinking more fluids is enough. Seek urgent medical advice if someone is unusually tired or confused, is dizzy when standing up and it does not go away, has fast breathing or a fast heartbeat, or is passing very little urine. Call emergency services for signs such as blue, grey or blotchy skin, cold skin, difficulty breathing, or being very hard to wake.
Who should talk to a doctor first?
People with kidney disease, heart failure or high blood pressure, and people taking diuretics or other medicines that affect fluid and minerals, should ask a doctor before using electrolyte supplements or salt substitutes. For these groups, both too much sodium and too much potassium can be a problem. Parents of babies and young children with vomiting or diarrhoea should get advice early, because young children become dehydrated faster.
The bottom line
Electrolytes are essential, but most people get more than enough sodium from food and would benefit more from extra vegetables, fruit and pulses for potassium. Electrolyte drinks have a real place during vomiting and diarrhoea and for long, sweaty exercise. The rest of the time, water and balanced meals do the job.
Frequently asked questions
Should I drink electrolytes every day?
Usually not. Most people get enough electrolytes from food, and many sports drinks add sugar and sodium you do not need. Water is the best everyday drink.
Are electrolyte drinks good for a stomach bug?
For vomiting or diarrhoea, oral rehydration solutions from a pharmacy replace fluid and salts. Seek medical advice if symptoms are severe or someone shows signs of serious dehydration.
Do I need electrolytes after a workout?
After a typical 30–60-minute session, water and your next meal are enough. Long sessions, endurance events or heavy sweating in the heat are when added sodium can help.
Can you have too many electrolytes?
Yes. Too much sodium raises blood pressure, and people with kidney disease can have problems with excess potassium. Check with a doctor before using supplements if you have a medical condition.
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Sources
This article is general information, not medical advice. If you have a health condition, are pregnant or under 18, talk to a doctor or registered dietitian before changing your diet.