Written by Mo, Foundi CSO, PhD · Updated 11 November 2026
Short answer: Less than the internet suggests. Timing matters mainly around long, hot or very sweaty exercise, where fluids before and sodium-containing drinks during can help replace what sweat removes. For everyday sipping, there's little evidence that morning, night or an empty stomach changes anything. The best time is the one that fits your routine.
Here's what the evidence does say about timing, and where the popular advice runs ahead of it.
Does timing matter on an ordinary day?
Not in any way the evidence supports.
On a desk day, your body keeps electrolyte levels steady on its own, mostly through the kidneys and thirst, using what you get from food. (See What electrolytes are, in plain language.) Sports-nutrition researcher Professor Graeme Close, quoted by the BBC, says there's little evidence that taking electrolyte products first thing in the morning has any impact.
If you like a flavoured drink with breakfast or mid-afternoon because it helps you drink more, that's a fine reason. It isn't a physiological window. (See Do you need electrolytes every day?)
What about before exercise?
For most workouts, water beforehand is enough. Dietitians of Canada suggest drinking about 250–500 mL of fluid up to 4 hours before exercise, with water usually the best choice.
They add that if you haven't produced urine, or it's still dark yellow, another 125–375 mL about 2 hours before is reasonable (Dietitians of Canada, Sports Nutrition: Facts on Hydration).
What about during exercise?
This is where electrolytes have their clearest role, but only for longer and sweatier efforts.
Dietitians of Canada say that if you're sweating a lot for more than 45 minutes, a sports drink may be better than water, because it helps replace the sodium lost in sweat. They suggest sipping every 10 to 15 minutes. For shorter or easier sessions, water is usually enough. (See Electrolytes vs water: when plain water is enough.)
| Session | Timing that tends to make sense |
|---|---|
| 30–45 minute moderate workout or an easy 5K | Water before and after; nothing special during |
| More than about 45 minutes of heavy sweating, or heat and humidity | Fluid before; a sodium-containing drink sipped during (Dietitians of Canada) |
| Long efforts of 90+ minutes | Fluids, sodium and carbohydrate during. Plan it like fuel, not just hydration |
(Running-specific version: Do you need electrolytes for a 5K?)
What about after exercise?
Water after most workouts. Dietitians of Canada also list milk or chocolate milk, 100% fruit juice and sports drinks as options. Your next meal usually covers the electrolytes.
After a long, very sweaty session, a meal with some salt and plenty of fluid is the ordinary way the body tops back up.
Is it OK to drink electrolytes at night or before bed?
For most healthy adults there's no evidence that bedtime is better or worse for electrolytes than any other time. The practical issue is simply that drinking a lot of anything late may mean waking up to use the bathroom.
If sleep is the real goal, the bigger lever is a steady schedule. (See A steadier sleep schedule.)
What about on an empty stomach?
There's no evidence of a special benefit. Some people find salty or sweet drinks easier on a full stomach; that's personal comfort, not physiology.
If you're managing a health condition, taking medication, or feeling unwell, timing and amounts are a question for your pharmacist or doctor.
A simple way to think about timing
- On ordinary days, timing is a habit question, not a science question. Pick a time that helps you drink enough overall.
- Before exercise: water, a few hours ahead.
- During exercise: water, unless you're sweating heavily for more than about 45 minutes. Then a sodium-containing drink can make sense.
- After: water and your next meal.
- Whenever you use one, count its sodium toward your daily total.
Common questions
Should I drink electrolytes in the morning or at night? For most people it makes no meaningful difference. Choose whichever time helps you stay consistent with drinking fluids through the day.
Should I drink electrolytes before or after a workout? For most workouts, water before and after is enough. Electrolytes are most useful during long, very sweaty sessions. Dietitians of Canada put the threshold at sweating a lot for more than about 45 minutes.
Can you drink electrolytes every day? Many people do, and an occasional or daily serving fits within a normal diet for most healthy adults. Just count the sodium. (See Do you need electrolytes every day?)
How many electrolyte drinks a day is too many? It depends on the sodium in each serving and in the rest of your food. Health Canada suggests most adults stay under 2,300 mg of sodium a day.
Sources
- Dietitians of Canada (Unlock Food). Sports Nutrition: Facts on Hydration (updated 30 Jan 2019). https://www.unlockfood.ca/en/Articles/Physical-Activity/Sports-Nutrition-Facts-on-Hydration.aspx. Accessed 9 Nov 2026.
- BBC News. Why you don't need electrolytes for everyday exercise (2 Jan 2026). https://www.bbc.com/news/articles/cev1v8wr8m7o. Accessed 9 Nov 2026.
- Health Canada. Sodium Intake of Canadians in 2017. https://www.canada.ca/en/health-canada/services/publications/food-nutrition/sodium-intake-canadians-2017.html. Accessed 9 Nov 2026.
- Harvard T.H. Chan School of Public Health, The Nutrition Source. Sports Drinks. https://nutritionsource.hsph.harvard.edu/sports-drinks/. Accessed 9 Nov 2026.
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