Do You Need Electrolytes?
When plain water is enough, when electrolytes help, and why sports drinks aren't rehydration drinks.
Short answer
Most people don't need an electrolyte drink for everyday hydration. Food covers the sodium and potassium you need, and plain water is enough for normal days and for exercise under about an hour. Electrolytes start to matter when you sweat hard for a long time, work out in serious heat, or lose fluid from vomiting or diarrhea. If you aren't in one of those situations, an electrolyte drink adds sugar and cost more than benefit.
Run the Daily Water Intake Calculator first to see how much you should be drinking.
What electrolytes are
Electrolytes are minerals that carry an electric charge in body fluid. The ones people usually mean are sodium and potassium. Michigan Medicine describes them as the minerals your body loses during illness, such as salt and potassium, when it loses fluid. Sodium also helps control how much water sits in and around your cells, which is why it comes up in our guide on how much water is too much.
Food covers most of it
In 2019 the National Academies set an adequate sodium intake of 1.5 grams a day for people 14 and older, including during pregnancy and breastfeeding. They also set a 2.3 gram level, above which cutting back is expected to lower chronic disease risk. They report that most people in the US and Canada eat more than both.
A health system dietitian quoted by UnityPoint Health makes the practical point: most people get enough sodium and electrolytes from food, and many processed foods already contain plenty of sodium. Daily electrolyte drinks without intense exercise, that source warns, can lead to an imbalance with symptoms like fatigue, an irregular heartbeat or stomach upset.
When electrolytes help
| Situation | Plain water enough? | What the sources say |
|---|---|---|
| Normal day, desk work or light activity | Yes | The National Academies say most healthy people meet their needs by drinking when thirsty. Food supplies the sodium. |
| Exercise under about an hour | Usually yes | A UnityPoint Health physician calls water the best choice for activity lasting under an hour. |
| Hard or long exercise, heavy sweating | Sometimes not enough on its own | The American College of Sports Medicine says drinks with electrolytes and carbohydrate can have benefits over water alone under certain circumstances. |
| Vomiting or diarrhea | Not ideal | Michigan Medicine says water lacks the electrolytes lost and may not be absorbed well during diarrhea. Mayo Clinic suggests water, broth or rehydration solutions, with guidance from a healthcare professional. |
The ACSM position stand also says sweat rates and the amount of electrolytes in sweat vary a lot between people, so it recommends a customized plan. It describes a simple way to estimate your own sweat rate: weigh yourself before and after exercise.
Sports drinks are not rehydration drinks
These two get mixed up. Michigan Medicine says sodas, fruit juices and sports drinks contain too much sugar and too few of the electrolytes you lose when you're sick, so they aren't suitable for rehydration. Oral rehydration solutions, the kind sold for children and adults with diarrhea, combine salt, sugar, potassium and other minerals in balanced amounts. Adult products shouldn't be given to babies or young children, and illness in infants, young children, older adults and people with long-term conditions can turn serious faster.
The UnityPoint physician describes sports drinks as mainly useful for strenuous exercise lasting more than an hour, where the carbohydrates help fuel you and the sodium and potassium help replace what you lose. The same source points out the downsides: added sugar, and acidity that can wear on tooth enamel. It says adding fruit, vegetables or a squeeze of lemon to water gives some electrolytes without much sugar.
More is not better
If you drink a lot to stay safe, electrolytes don't make it risk free. The 2015 consensus statement on exercise-associated hyponatremia notes that sports drinks have less sodium than your blood, so they don't prevent low blood sodium when intake is excessive. The panel calls drinking palatable fluids when thirsty the safest individualized strategy.
People with high blood pressure, kidney disease or heart disease should be especially careful with added sodium. If any of that applies to you, ask your clinician before adding electrolyte products.
A simple check
Ask three questions. Are you sweating hard for more than an hour? Have you been vomiting or had diarrhea? Are you in a very hot place for hours? If the answer to all three is no, water and normal meals are probably enough. If yes, an electrolyte drink or a salty snack with your water is reasonable, unless you have high blood pressure, kidney or heart disease. Call a doctor if you can't keep fluids down, or if a baby, young child or older adult is ill. For daily water targets, the calculator and our chart on water intake by weight are better starting points than any drink label.
This is a general guide, not a medical recommendation. Your own needs depend on your health, medicines and how much you sweat.
Keep reading
Frequently asked questions
Do I need electrolytes every day?
Probably not. The National Academies' adequate sodium intake is 1.5 grams a day, and they report that most people in the US and Canada eat more than that and more than their 2.3 gram level, so food already supplies it. A health system physician warns that drinking electrolyte beverages daily without intense exercise can lead to an imbalance.
Is water enough for a workout?
For activity under about an hour, usually yes. For longer or harder sessions, the ACSM says drinks with electrolytes and carbohydrate can help under certain circumstances.
Are sports drinks good for dehydration from illness?
Not according to Michigan Medicine, which says sports drinks contain too much sugar and too few of the electrolytes lost in illness. An oral rehydration solution is the better choice, and a clinician can advise you, especially for children and older adults.
Can you drink too many electrolytes?
Yes. Too much sodium can raise blood pressure over time, and the National Academies set a 2.3 gram level above which cutting back is expected to lower chronic disease risk. Daily electrolyte drinks without heavy exercise were linked by a health system physician to fatigue, an irregular heartbeat or stomach upset.
Do electrolytes prevent overhydration?
Not if you drink too much of them. The consensus statement notes sports drinks contain less sodium than blood, so excessive intake can still dilute blood sodium.
Sources
- National Academies of Sciences, Engineering, and Medicine, news release on dietary intake levels for water, salt, and potassium, Feb. 11, 2004: https://www.nationalacademies.org/news/report-sets-dietary-intake-levels-for-water-salt-and-potassium-to-maintain-health-and-reduce-chronic-disease-risk
- Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. American College of Sports Medicine position stand. Exercise and fluid replacement. Medicine & Science in Sports & Exercise 39(2):377 to 390, 2007. Abstract via PubMed: https://pubmed.ncbi.nlm.nih.gov/17277604/ (DOI 10.1249/mss.0b013e31802ca597)
- Michigan Medicine, "Rehydration drinks": https://uofmhealth.org/health-library/str2254
- UnityPoint Health, "Water vs. Electrolyte Drinks: What's Best for our Bodies": https://www.unitypoint.org/news-and-articles/water-vs-sports-drinks-whats-best-for-our-bodies---unitypoint-health
- Mayo Clinic Staff, "Water: How much should you drink every day?": https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/water/art-20044256
- Hew-Butler T, Rosner MH, Fowkes-Godek S, et al. Statement of the 3rd International Exercise-Associated Hyponatremia Consensus Development Conference, Carlsbad, California, 2015. British Journal of Sports Medicine 49(22):1432 to 1446. Citation details via PubMed: https://pubmed.ncbi.nlm.nih.gov/26227507/ (DOI 10.1136/bjsports-2015-095004)
- National Academies Press. Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate, 2005. Water chapter: https://www.nationalacademies.org/read/10925/chapter/6
- National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes for Sodium and Potassium, 2019 (highlights): https://nap.nationalacademies.org/resource/25353/030519DRISodiumPotassium.pdf
How this page was built. This guide was drafted with AI assistance for Daily Water Calculator from the National Academies sodium figures, the American College of Sports Medicine position stand abstract, the 2015 exercise-associated hyponatremia consensus statement, and consumer pages from Michigan Medicine, UnityPoint Health and Mayo Clinic. The health system pages are patient education, not clinical guidelines, and the page treats them that way. No product is recommended or linked. We recheck the sources when the calculator is updated. Last reviewed: .
General information for healthy adults, not medical advice. If you are pregnant or breastfeeding, or you have kidney, heart or liver conditions or a fluid limit, ask a clinician first. Terms and medical disclaimer.