Sports Drink vs Water
For everyday hydration and exercise under 60 minutes, water is enough. A sports drink earns its place in long, intense, or hot sessions, where sodium and carbohydrate matter. In the lab, the sports drink retained fluid no better than water.
Quick answer
Sports Drink vs Water
For everyday hydration and exercise under 60 minutes, water wins. In the Beverage Hydration Index, the sports drink's 4-hour urine output was not significantly different from water (hydration index ≈ 1.0 vs water's 1.00; Maughan 2016) — so it adds sugar and cost without better retention. A sports drink earns its place only in long, intense, or hot exercise, where its sodium and carbohydrate matter.
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Plain water and sports drinks both rehydrate you, but they are not interchangeable. In the Beverage Hydration Index study, 72 men each drank 1 L of a test beverage; the sports drink's cumulative 4-hour urine output was not significantly different from water, giving a hydration index of about 1.0 (Maughan 2016). In other words, for retention at rest, the sports drink behaved just like water, only with added sugar and cost. Where a sports drink does earn its keep is in long, intense, or hot exercise. Elite soccer players lost about 2.0 L of sweat over 90 minutes in 24-29°C training, roughly 1.35 L/h, with sweat sodium near 49 mmol/L (Maughan 2004); in extreme heat, soccer sweat rates have reached as high as ~4.1 L/h (Mohr 2012). The ACSM sets >2% body-mass loss from water deficit as the threshold to avoid (Sawka 2007). When sessions push past about an hour, get hot, or drive heavy sodium losses, the carbohydrate and electrolytes in a sports drink start to matter; for daily sipping and short workouts, water wins on cost and sugar.
Sports Drink vs Water: Head to Head
| Feature | Water | Sports Drink |
|---|---|---|
| Fluid retention at rest (1 L dose) | Reference baseline, BHI = 1.00 (Maughan 2016) | BHI ≈ 1.0 — 4-hour urine output not significantly different from water (Maughan 2016) |
| Best use case | Everyday hydration and exercise under 60 minutes | Long, intense, or hot exercise where sodium and carbohydrate help |
| Sodium | Essentially none | Helpful when sweat sodium losses are high — soccer sweat measured at ~49 mmol/L (Maughan 2004) |
| Carbohydrate / energy | None | Carbohydrate fuels prolonged effort; adds sugar and calories for daily use |
| Cost and sugar for daily hydration | Lowest cost, no sugar | Costs more and adds sugar with no retention advantage over water at rest (Maughan 2016) |
| When dehydration starts to hurt | Keep body-mass loss under 2% (Sawka 2007) | Helps replace fluid and electrolytes once sweat losses are heavy (~1.35 L/h up to ~4.1 L/h in heat; Maughan 2004; Mohr 2012) |
What the Beverage Hydration Index Found
| Beverage | 2-hour BHI vs water | What it means |
|---|---|---|
| Still water | 1.00 (reference) Water is anchored at 1.00. A BHI above 1.0 means a drink is retained better than plain water over the 4-hour window. | |
| Sports drink | ≈ 1.0 (not different from water) Cumulative 4-hour urine output after the sports drink was not significantly different from water — no retention advantage at rest. | |
| Oral rehydration solution (ORS) | 1.54 ± 0.74 ORS retained significantly more fluid than water at 2 hours, producing about 362 g less urine over 4 hours (95% CI 222-505). | |
| Skim milk | 1.58 ± 0.60 Skim milk hydrated significantly better than water — about 339 g less urine over 4 hours (95% CI 190-489) — thanks to its electrolytes and energy. | |
| Full-fat milk | 1.50 ± 0.58 Full-fat milk also outperformed water, with about 294 g less urine over 4 hours (95% CI 154-434) and an energy density of 640 kcal/L. |
When a Sports Drink Earns Its Place
Sessions Longer Than About an Hour
Water is sufficient for everyday hydration and exercise under 60 minutes. Once effort runs longer, the carbohydrate in a sports drink helps fuel sustained work while you replace fluid — useful for full 90-minute matches and long endurance sessions.
Hot Conditions and Heavy Sweating
Soccer players lost about 2.0 L of sweat over 90 minutes (~1.35 L/h) in 24-29°C training (Maughan 2004), and match sweat rates have reached as high as ~4.1 L/h in extreme 43°C heat (Mohr 2012). When you sweat that much, the sodium in a sports drink helps you hold onto the fluid you drink.
High Sodium Losses
Measured sweat sodium in elite soccer players averaged about 49 mmol/L (Maughan 2004), and it varies widely between individuals. Heavy or salty sweaters lose more, and replacing that sodium — via a sports drink or ORS — supports rehydration better than water alone.
Crossing the 2% Threshold
The ACSM sets a body-mass loss above 2% from water deficit as the point where performance is compromised (Sawka 2007). When a long, hot session threatens that threshold, an electrolyte drink helps keep you on the right side of it.
Choosing Between Water and a Sports Drink
- For daily hydration and workouts under 60 minutes, choose water — it matched the sports drink for retention in the Beverage Hydration Index (Maughan 2016), at lower cost and with no sugar
- Reach for a sports drink in long, intense, or hot exercise, where its carbohydrate and sodium help you fuel and hold onto fluid
- Aim to keep exercise body-mass loss under 2%, the ACSM threshold for compromised performance (Sawka 2007)
- If you are a heavy or salty sweater — sweat sodium near 49 mmol/L was measured in elite players (Maughan 2004) — prioritize sodium replacement during prolonged effort
- For recovery after heavy sweat losses, milk and oral rehydration solution retained fluid best in the study (skim milk 1.58, ORS 1.54, full-fat milk 1.50 vs water 1.00; Maughan 2016)
- Don't add sugar you don't need: at rest the sports drink offered no retention edge over plain water (Maughan 2016)
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- Sports drink BHI ≈ 1.0 (n.s. vs water) — In the Beverage Hydration Index study, cumulative 4-hour urine output after the sports drink was not significantly different from water, giving a hydration index of about 1.0.[1]
- water = 1.00 reference — Still water is the BHI reference, anchored at 1.00; a BHI above 1.0 means a drink is retained better than plain water over the 4-hour window.[1]
- ORS 1.54; skim milk 1.58; full-fat milk 1.50 vs water 1.00 — Oral rehydration solution, skim milk and full-fat milk all hydrated significantly better than water at 2 hours, unlike the sports drink.[1]
- ORS -362 g; skim milk -339 g; full-fat milk -294 g vs water — Higher-BHI drinks produced less urine than water over 4 hours: ORS about 362 g less, skim milk about 339 g less, full-fat milk about 294 g less.[1]
- full-fat milk 640 kcal/L — Full-fat milk has an energy density of 640 kcal/L, illustrating how added energy slows fluid loss compared with plain water or a sports drink at rest.[1]
- 0 beverages below water BHI — No beverage tested scored significantly below water; none caused net dehydration at a 1 L dose.[2]
- ~1.35 L/h; 1.37% BML; Na+ 49 mmol/L — Elite soccer players lost about 2.0 L of sweat over 90 minutes (~1.35 L/h) with a 1.37% body-mass loss and sweat sodium near 49 mmol/L in 24-29°C training.[3]
- ~2.6 L/h temperate up to ~4.1 L/h extreme heat — In hot-weather competition, soccer sweat rates climbed from ~2.6 L/h in temperate conditions up to ~4.1 L/h in extreme 43°C heat.[4]
- >2% body-mass loss threshold — The ACSM position stand sets prevention of >2% body-mass loss from water deficit as the threshold to avoid compromised performance.[5]
- [1]Maughan 2016 (Am J Clin Nutr) — Maughan RJ, Watson P, Cordery PA, Walsh NP, Oliver SJ, Dolci A, Rodriguez-Sanchez N, Galloway SD. A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index. Am J Clin Nutr. 2016 Mar;103(3):717-23.PMID: 26702122DOI: 10.3945/ajcn.115.114769
- [2]ACE ProSource 2016 — American Council on Exercise (ACE) ProSource, April 2016. The Newest Index on the Block: The Hydration Index (summary of Maughan et al. 2016).
- [3]Maughan 2004 (Int J Sport Nutr Exerc Metab) — Maughan RJ, Merson SJ, Broad NP, Shirreffs SM. Fluid and electrolyte intake and loss in elite soccer players during training. Int J Sport Nutr Exerc Metab. 2004 Jun;14(3):333-46.PMID: 15256693
- [4]Mohr 2012 (Scand J Med Sci Sports) — Mohr M, Mujika I, Santisteban J, et al. Examination of fatigue development in elite soccer in a hot environment / hydration and sweating responses to hot-weather football competition. Scand J Med Sci Sports. 2012. PMID 21029200.PMID: 21029200
- [5]ACSM/Sawka 2007 (Med Sci Sports Exerc) — Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. American College of Sports Medicine position stand. Exercise and fluid replacement. Med Sci Sports Exerc. 2007 Feb;39(2):377-90.PMID: 17277604DOI: 10.1249/mss.0b013e31802ca597
Last reviewed: 2026-06-20. Every figure on this page is sourced to the named primary references above.
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Frequently Asked Questions
Sports drink vs water: which is better for daily hydration?
For everyday hydration, water wins. In the Beverage Hydration Index study, the sports drink's 4-hour urine output was not significantly different from water, giving a hydration index of about 1.0 versus water's reference of 1.00 (Maughan 2016). Since it retained fluid no better than water, a sports drink adds sugar and cost without a hydration advantage for daily sipping.
When do you actually need a sports drink?
A sports drink earns its place in long, intense, or hot exercise. Water is enough for everyday hydration and workouts under 60 minutes. Once sessions run longer, get hot, or drive heavy sweat losses — soccer players sweat about 1.35 L/h, rising to ~4.1 L/h in extreme heat (Maughan 2004; Mohr 2012) — the carbohydrate and sodium in a sports drink help you fuel and hold onto fluid.
Does a sports drink hydrate you better than water?
Not at rest. In Maughan et al. (2016), the sports drink produced cumulative 4-hour urine output that was not significantly different from water, for a hydration index of roughly 1.0. By contrast, oral rehydration solution (1.54), skim milk (1.58) and full-fat milk (1.50) all retained significantly more fluid than water at 2 hours. The sports drink's advantage is fueling and sodium during prolonged exercise, not superior retention.
Why is water enough for exercise under an hour?
For shorter, cooler sessions your sweat and sodium losses are modest, so plain water replaces fluid effectively without added sugar. The carbohydrate and electrolytes in a sports drink mainly help during prolonged or hot exercise, where sweat rates climb (~1.35 L/h up to ~4.1 L/h in heat; Maughan 2004; Mohr 2012) and the goal is to keep body-mass loss under the 2% threshold (Sawka 2007).
How much sodium do you lose in sweat during exercise?
It varies widely between individuals. In elite soccer players, measured sweat sodium averaged about 49 mmol/L (Maughan 2004). Heavy or salty sweaters lose more. When sweat losses are large and prolonged, replacing sodium — via a sports drink or oral rehydration solution — helps your body retain the fluid you drink, which is why these drinks earn their place in long, hot sessions.
At what point does dehydration hurt performance?
The American College of Sports Medicine sets a body-mass loss above 2% from water deficit as the threshold that compromises performance (Sawka 2007). When a long, hot, or intense session threatens that level — soccer players can lose 1.37% body mass in 90 minutes of temperate training and far more in heat (Maughan 2004; Mohr 2012) — a sports drink's fluid and electrolytes help keep you on the right side of it.
Is water or a sports drink better for recovery?
After heavy sweat losses, drinks with electrolytes and energy retain fluid best. In the Beverage Hydration Index, skim milk (1.58), oral rehydration solution (1.54) and full-fat milk (1.50) all hydrated significantly better than water (1.00) at 2 hours, while the sports drink matched water at about 1.0 (Maughan 2016). For recovery, milk or ORS beat both plain water and a typical sports drink.
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