Electrolyte Drinks: When You Need Them

FITNESS · GLOBAL

Electrolyte Drinks: When You Need Them

What electrolytes do, when they matter, the hyponatraemia risk and everyday use

Electrolyte products have moved from endurance sport into everyday life, and the situations where they genuinely help are narrower than the marketing suggests.

What they do

Sodium, potassium, magnesium and chloride are lost in sweat and are involved in fluid balance, nerve signalling and muscle contraction. Sodium is the one lost in meaningful quantities.

Sodium also helps retain the fluid you drink, which is why rehydration solutions contain it alongside a little sugar.

When they matter

Prolonged exercise beyond about an hour, particularly in heat. Heavy sweating over a long day. Illness with vomiting or diarrhoea, where oral rehydration salts are a genuine medical intervention.

For an hour in a gym, water and an ordinary diet cover it. A normal diet already provides far more sodium than most people lose.

Drinking too much water is the real danger

Deliberately drinking far more than thirst dictates dilutes blood sodium, which causes exercise-associated hyponatraemia. It has killed marathon runners, and the symptoms — nausea, headache, confusion, swelling — resemble dehydration, which is why people drink more and make it worse.

Drink to thirst rather than to a schedule. More is not safer.

Reading a label

Check the sodium in milligrams per serving, since products vary from token amounts to very high doses. High-sodium products suit heavy sweating in heat and are unnecessary otherwise.

Who should take care

Anyone with high blood pressure, heart or kidney disease should speak to a doctor before taking high-sodium products regularly.

Making your own

Water, a little salt and some juice or squash does most of what a commercial electrolyte drink does, for almost nothing. Oral rehydration salts from a pharmacy are the correct product for illness.

Check the sugar content of anything ready-made, since some are essentially soft drinks with added salt.

Heat

In hot conditions, slow down, seek shade and recognise heat exhaustion — dizziness, nausea, heavy sweating and cramps. Confusion or hot dry skin is heatstroke and a medical emergency.

Everyday hydration

Drink to thirst and check urine colour — pale straw is about right. Food contributes a meaningful proportion, and tea, coffee and milk all count towards fluid intake despite the persistent myth.

Older adults feel thirst less reliably and benefit from drinking to a routine.

Reading a sports drink label

Isotonic drinks contain carbohydrate as well as electrolytes and suit exercise over an hour. Zero-calorie electrolyte tablets provide salts without fuel, which suits people who eat during exercise.

Check sugar per 100ml, since some are essentially soft drinks.

Illness

Use proper oral rehydration salts rather than a sports drink for vomiting or diarrhoea, particularly for children.

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