Electrolytes: Do You Actually Need Them?

Slug: do-you-need-electrolytes-guidePillar: Health and Fitness > WellnessKeyword: do you need electrolytesExcerpt: Electrolyte drinks are everywhere, but water is enough for most workouts under an hour. When electrolytes genuinely help — and when they're just expensive salt.

For most people doing under an hour of exercise, plain water is all the hydration you need — the electrolyte drink is optional flavouring, not fuel. Electrolytes start genuinely mattering when you sweat hard for over 60–90 minutes, train in heat and humidity, or you're a visibly "salty sweater." Here's what electrolytes actually do, the signs you need them, and how to replace them without spending £1.50 a sachet.

This is general information, not medical advice. If you have kidney disease, high blood pressure, or take medication affecting sodium or potassium, talk to your doctor before using electrolyte supplements.

What Electrolytes Actually Do

Electrolytes — mainly sodium, potassium, magnesium, calcium and chloride — are minerals that carry an electrical charge when dissolved in your body's fluids. That charge drives the signalling behind every heartbeat, nerve impulse and muscle contraction, and it controls how water moves between your cells and your blood. Health systems like Ohio State's Wexner Medical Center put it simply: electrolytes help your body absorb and hold onto the right amount of water. Too few and hydration falters no matter how much you drink.

When you sweat, you lose water and minerals together — and the one you lose by far the most of is sodium. That's why serious electrolyte products are mostly salt, whatever the marketing implies about exotic minerals.

When Water Alone Is Enough

Sports nutrition research and clinical guidance broadly agree: for exercise under about 60–90 minutes at low to moderate intensity, water covers you. A 45-minute gym session, a half-hour jog, the school-run walk — your body's sodium reserves handle these easily, and you'll replace the small losses at your next meal. A normal diet already supplies more sodium than most of us need.

So the daily electrolyte sachet habit? For most people it's just expensive, salty squash. Your kidneys excrete the surplus.

When Electrolytes Genuinely Help

The picture changes when losses get big. Consider electrolytes when:

• Exercise runs past 60–90 minutes — long runs, rides, hikes, football matches.
• It's hot or humid — sweat rates can double or triple in summer conditions.
• You're a heavy or salty sweater — the tell-tale sign is white, crusty residue on your skin, cap or dark clothing after training. That's dried salt, and it means you lose more sodium than average.
• You're sick — vomiting and diarrhoea drain fluids and minerals fast, which is why oral rehydration salts like Dioralyte exist.
• You've had cramping, dizziness or headaches during long, sweaty sessions despite drinking plenty of water.

There's also an under-appreciated danger in drinking only plain water during very long events: you can dilute your blood sodium (hyponatraemia), which is genuinely dangerous. For marathon-length efforts, some sodium intake alongside fluids is standard advice.

How Much to Drink

Johns Hopkins sports dietitians suggest a practical rhythm during exercise: roughly 90–240ml (3–8oz) of fluid every 10–20 minutes, scaled to how heavily you sweat. Thirst is a decent guide for shorter sessions; for longer ones, drinking to a schedule works better because thirst lags behind actual losses.

Cheap Ways to Replace Electrolytes

You don't need a subscription. After a long sweaty session, any of these does the job:

• Food + water — a salty meal after training replaces sodium naturally; a banana adds potassium; yoghurt and nuts contribute calcium and magnesium.
• DIY sports drink — 500ml water, a good pinch of salt (about ¼ tsp), and a splash of fruit juice or squash for sugar and taste. Costs pennies.
• Milk — unglamorous, but it contains sodium, potassium, fluid, carbs and protein, and performs impressively in rehydration studies.
• Commercial options — tablets and powders (Science in Sport, Precision Hydration, LMNT and the like) are convenient for training bags. Check the sodium content: for heavy sweating you want a meaningful dose (300mg+ per serving), not a token sprinkle. If the label leads with vitamins instead of sodium, it's a vitamin drink wearing sports kit.

Hydration also does its best work alongside decent recovery — our guide to improving sleep quality naturally (https://eight2infinity.com/how-to-improve-sleep-quality-naturally/) covers the other half, and there's more in our health and fitness (https://eight2infinity.com/category/health-and-fitness/) section.

FAQ

Should I drink electrolytes every day?

Most people eating a normal diet don't need to — you'll simply excrete the extra sodium. Daily supplementation makes sense mainly for people training long hours, working physically in heat, or advised to by a clinician.

What are the signs of low electrolytes?

Muscle cramps, unusual fatigue, headache, dizziness and nausea during or after long sweaty exercise are the common ones. Severe symptoms — confusion, vomiting, seizures — need urgent medical attention.

Are electrolyte drinks better than water for hangovers?

Slightly, at best. Alcohol causes fluid loss, so rehydrating helps, but there's nothing magic about electrolyte products for hangovers — water plus food achieves much the same.

Do electrolytes have calories?

The minerals themselves don't. Many sports drinks pair them with sugar for energy — useful during endurance exercise, unnecessary on the sofa. Sugar-free electrolyte tablets exist for hydration without the calories.