Water or electrolytes? It's one of the most common hydration questions, and the honest answer is that for most of your day, plain water does the job. Electrolytes earn their place when you sweat hard, train long or work in the heat. Here's how to tell the difference, without the hype.
What are electrolytes?
Electrolytes are minerals that carry an electric charge once they're dissolved in your body's fluids. Sodium, potassium, chloride, magnesium and calcium are the ones you'll see on labels. Your body uses them to manage fluid balance and to keep muscles and nerves working normally.
Most people get plenty of electrolytes from food. You also lose them through sweat, and sodium is the main one that leaves in sweat. That's why the "water vs electrolytes" question really comes down to how much you're sweating.
How much fluid do you need each day?
According to healthdirect, men need about 10 cups of fluids a day and women need about 8 cups, with a little more during pregnancy or breastfeeding. Healthdirect also recommends choosing tap water over drinks with added sugar or alcohol, and drinking early on hot days or when you're exercising.
For everyday life (office work, a walk, a cool day), water and normal meals usually cover it.
When water is enough
- Everyday hydration. Desk days, errands, school runs and general living.
- Short or light exercise. A gentle walk, a stretch session or an easy gym workout in a cool room.
- When you'll eat soon after. A normal meal brings sodium and other electrolytes along with it.
When electrolytes can help
The Australian Institute of Sport electrolyte fact sheet lists situations where electrolyte replacement is useful for athletes. Translated to everyday life, they look like this:
Big sweat sessions
Long or intense training, high sweat rates, or "salty sweat" (white marks on your hat or shirt) mean you're losing more sodium than usual.
Training or working in the heat
Hot Australian days ramp up sweat losses. The AIS notes electrolytes can be used before exercise in hot conditions where large sweat losses can't practically be replaced during the session.
Rehydrating after a big fluid loss
The AIS links electrolyte replacement to rehydrating after moderate to severe dehydration, giving the example of fluid losses greater than 2% of body mass. It suggests drinking roughly 1.2 to 1.5 times the estimated fluid deficit within 2 to 4 hours after the activity. Sodium plays a role in how your body holds on to that fluid.
Long shifts in hot conditions
Firefighters, tradies, nurses and other shift workers often sweat for hours with no set breaks. We cover this in detail in our post on hydration for shift workers.
Can you drink too much water?
Yes. Healthdirect notes that drinking too much during intense physical activity can occasionally lead to hyponatraemia, where blood sodium becomes dangerously diluted. The AIS fact sheet makes the same point: excessive fluid intake is the main cause, and adding sodium doesn't make overdrinking safe. The goal is to drink to replace what you lose, not to force down as much as possible.
A simple way to decide
- Not sweating much? Drink water.
- Sweating through your shirt, training over an hour or working in the heat? Water plus electrolytes.
- Finished a big session and back at it soon? Rehydrate with fluid and sodium, then eat a proper meal.
- Feeling unwell, dizzy or confused in the heat? Stop, cool down and get medical help.
What to look for in an electrolyte drink
If you do reach for electrolytes, read the label. Check how much sodium is in a serve, whether sugar has been added, and what the ingredients actually are. Our guide to choosing an electrolyte drink in Australia walks through it step by step.
Uthrive is a lightly sparkling, ready to drink natural hydration drink in a 355mL can. The electrolytes come from certified organic Lake Deborah salt from Western Australia, combined with real fruit juice and natural flavour. No added sugar, nothing artificial. Grab it online or find a stockist near you, including WHSmith airport stores, City Cave and Go Vita.
Hydrated by Nature
Uthrive is a lightly sparkling natural hydration drink made with Lake Deborah salt from Western Australia, real fruit juice and no added sugar. Built by a firefighter.
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Are electrolytes better than water?
Not for everyday hydration. Water is the right choice most of the time. Electrolytes are more useful when you're sweating heavily, training for a long time or working in hot conditions.
Is it OK to drink electrolytes every day?
It depends on how much you sweat. If you train hard or work outdoors in summer, a daily drink with electrolytes can sit alongside water. If you're mostly indoors and eating normal meals, water is usually enough. If you have a health condition, check with your doctor first.
How do I know if I need electrolytes?
Look at the conditions: long or intense sessions, hot weather, heavy sweating or salt marks on your clothes are all signs you're losing more sodium than usual and may want electrolytes as well as water.
This article is general information, not medical advice. If you have a health condition, or feel unwell in the heat, talk to your doctor.