Electrolytes vs Water
Liquid IV and LMNT spent a billion dollars telling you that you need electrolytes every day. You mostly don't. Here is when you actually do.
Quick answer
Electrolytes vs Water
For most people water is enough. A balanced diet already covers sodium, potassium, and magnesium at intake levels that match 2–3 L of water loss per day. Daily electrolyte sachets are a product strategy, not a physiological requirement. Exceptions: sweating more than 1 L in a session, illness with vomiting or diarrhoea, fasting over 18 hours, first two weeks of keto, and first days in a tropical climate.
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The electrolyte category has exploded — Liquid IV did $1B+ in revenue in 2023, LMNT added another $200M, and the supplement aisle now has 40+ brands selling sodium-and-potassium sachets. The marketing is coherent and convincing: electrolytes help you hydrate 'faster,' 'better,' 'more completely.' Most of that is true under specific conditions. Almost none of it is true under the condition most buyers are actually in — a desk worker drinking 1.5 L a day in a temperate climate and eating normally. This page walks exactly when electrolytes earn their place and when they do not, using the science rather than the packaging.
When each one wins — 12 real situations
| Feature | Plain water | Electrolyte drink |
|---|---|---|
| Desk day, 3 L target | ✓ Enough on its own | Unnecessary |
| Sedentary, temperate climate | ✓ Enough on its own | Unnecessary |
| 60-min gym session (moderate sweat) | ✓ Enough on its own | Optional |
| 90+ min endurance (run, cycle, sport) | Incomplete | ✓ Needed for performance |
| Hot, humid day outdoors | Incomplete | ✓ Sweat rate 1–2 L/hr possible |
| Stomach bug — vomiting or diarrhoea | Risky | ✓ ORS specifically |
| Fasting 16:8 (short fast) | ✓ Enough on its own | Unnecessary |
| Fasting 24+ hours | Incomplete | ✓ Sodium drops with no food |
| Low-carb / keto (first 2 weeks) | Incomplete | ✓ Prevents 'keto flu' |
| Flight over 4 hours | ✓ Enough on its own | Optional |
| First day in tropical climate | Incomplete | ✓ Acclimatisation sweat loss |
| Hangover recovery | ✓ Plain water + salty breakfast | Optional |
The real rules — when to reach for electrolytes
Exercise sweating > 1 L in a session
Rule of thumb: if your shirt is soaked through, you have lost enough sodium that a drink with 400–700 mg sodium helps recovery. Anything under that is a water-only event.
Source: American College of Sports Medicine, Position Statement on Fluid Replacement
Any illness with fluid loss
Vomiting or diarrhoea loses sodium at 80–100 mmol/L, far faster than food can replace. Use ORS (WHO-formulated) as first-line. Commercial sports drinks are a poor second because sugar is too high and sodium too low.
Fasting beyond 18 hours
With no food intake, sodium drops sharply after the first day. A single sachet of 500–1000 mg sodium per day prevents the fasting headache and dizziness most first-time fasters blame on low blood sugar.
First 2 weeks on a low-carb or keto diet
Reduced insulin causes the kidneys to dump sodium. This is the cause of 'keto flu.' 500–1000 mg supplemental sodium per day resolves it. Does not apply long-term.
Acclimatising to a tropical climate
The first 5–7 days in heat or humidity, sweat rate is higher than your trained baseline. Electrolyte drinks during outdoor activity are reasonable. After 7 days, your body adjusts and you can return to plain water + food.
How to get electrolytes without buying a sachet
- Salt a glass of water: 1/4 tsp salt + 250 ml water + squeeze of lemon = 500 mg sodium, 10 cents
- Coconut water: ~600 mg potassium and ~250 mg sodium per 250 ml — watch sugar on sweetened brands
- Dilute fruit juice 1:1 with water and add a pinch of salt — closer to ORS ratios than most commercial drinks
- Eat a salty snack with water: pickles, olives, salted nuts, cheese + crackers deliver sodium, potassium, magnesium in one hit
- Broth: 1 cup of chicken or vegetable broth delivers 500–900 mg sodium plus potassium, ideal during illness
- Bananas + water: a standard banana gives 420 mg potassium, covers most moderate workout needs
- Greek yoghurt + a pinch of salt: protein + sodium + potassium + calcium for post-workout recovery
When electrolyte imbalance becomes a medical problem
Signs of Dehydration
- Muscle cramps or twitches during or after exercise — sodium deficit
- Nausea and headache together during endurance exercise — possible hyponatraemia from over-drinking water without sodium
- Irregular heartbeat or palpitations alongside fatigue — possible potassium or magnesium imbalance
- Confusion or disorientation during illness with vomiting or diarrhoea — severe dehydration plus electrolyte loss, needs ER
- Seizures, extreme weakness, or fainting — medical emergency
- Swelling in hands, feet, or face alongside heavy electrolyte-drink use — possible sodium overload, especially with high blood pressure or kidney disease
- Persistent muscle weakness after starting a low-carb diet that does not resolve with sodium — consult a clinician for potassium and magnesium levels
When to Contact Your Healthcare Provider
- Seizures, fainting, or confusion alongside fluid loss — emergency
- Muscle cramps that persist after a full day of rehydration
- Irregular heartbeat with fatigue — needs electrolyte panel
- Heavy daily electrolyte use alongside hypertension, kidney disease, or heart failure — discuss sodium load with clinician
- Cramps or weakness that return despite addressing sodium — check potassium and magnesium
Start with the daily number, not the sachet
Before you spend $30/month on electrolyte sachets, find out whether you are even hitting your water target. The calculator gives you the number; Vari tracks against it.
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Frequently Asked Questions
Should I drink electrolytes every day?
For most people, no. A balanced diet of whole foods already covers sodium, potassium, and magnesium at intake levels that support 2–3 L of water loss per day. Daily electrolyte sachets are a product strategy, not a physiological requirement. Exceptions: you sweat more than 1 L per day, you are on a low-carb or fasting protocol, you live in a tropical climate, or you are recovering from a stomach bug.
Is electrolyte water better than normal water?
Not for most users on most days. If you are drinking to a personalised target and eating normally, plain water + food is chemically equivalent to water + a sachet — and a lot cheaper. Electrolyte water beats plain water during heat, endurance exercise, illness-related fluid loss, and fasting windows.
What is the difference between ORS and electrolyte drinks like Liquid IV or LMNT?
ORS (oral rehydration salts) is a WHO-formulated medical product with a fixed sodium-to-glucose ratio designed for diarrhoea and severe dehydration. Commercial electrolyte drinks are wellness products with variable formulas, usually higher sodium and lower glucose than ORS. For sickness rehydration, use ORS. For workouts or hot-weather sweat replacement, either works but ORS is cheaper.
Can electrolyte drinks cause harm if I take them every day?
Most healthy adults tolerate daily electrolyte sachets, but the sodium loads (500–1000 mg per sachet) can push people with high blood pressure, kidney disease, or heart failure over safe limits. If you are on salt-restriction advice from a clinician, skip daily electrolytes and use them only for genuine high-loss days.
When is water alone not enough?
Sweating more than 1 L in a session (hot workout, long run, manual labour in heat), stomach bug with vomiting or diarrhoea, the first 48 hours of a fast over 18 hours, endurance events over 2 hours, first day in a tropical climate, and first-trimester pregnancy with vomiting. Those are the real cases. Everything else is marketing.
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