Sports drinks are appropriate when you’re exercising at high intensity for longer than 60 minutes. Below that threshold, plain water handles hydration just as well for most people. The American College of Sports Medicine recommends water for sessions under an hour and a sports beverage containing 5 to 8 percent carbohydrate with electrolytes for anything longer.
That one-hour mark isn’t arbitrary. It reflects the point at which your body has burned through enough fuel and lost enough sodium in sweat that a combination of sugar, salt, and water genuinely helps you perform better and recover faster. Outside of that specific scenario, sports drinks add calories and acid your teeth don’t need.
What Sports Drinks Actually Do
A sports drink is essentially sugar water with a small amount of sodium and potassium. The sugar and sodium aren’t just for taste. In the lining of your small intestine, a transport protein pulls sodium and glucose into the body together, and water follows along with them. This means fluid gets absorbed faster when it contains both sugar and salt than when you drink plain water alone. That faster absorption matters during prolonged exercise when you’re losing fluid through sweat faster than your gut can keep up.
The carbohydrate also serves as fuel. During high-intensity exercise lasting more than an hour, your muscles are depleting their stored energy. Sipping a drink with 5 to 8 percent carbohydrate helps sustain performance and delay fatigue. The ACSM recommends drinking about half a liter to one liter of a sports drink per hour during these longer sessions.
How Much Sodium You Lose in Sweat
Sweat contains more than just water. People working or exercising in moderately hot conditions for a full day can lose 4.8 to 6 grams of sodium, the equivalent of 10 to 15 grams of table salt. During a single hour of intense exercise, losses are smaller but still meaningful, especially in heat or if you’re a heavy sweater.
For short workouts, your body has plenty of sodium in reserve, and you’ll replace what you lost at your next meal. For longer efforts, especially in the heat, replacing some sodium during exercise helps your body hold onto the fluid you’re drinking rather than simply passing it through. This is where a sports drink has a real advantage over water.
When Water Is All You Need
For exercise under 60 minutes, the ACSM recommends drinking 3 to 8 fluid ounces of water every 15 to 20 minutes. That covers a typical gym session, a 30-minute run, a recreational bike ride, or a pickup basketball game. Your body’s existing fuel stores and electrolyte reserves are more than sufficient for efforts of this length.
The same applies to everyday hydration. Sitting at a desk, running errands, or doing light yard work doesn’t create the kind of fluid and electrolyte deficit that requires anything beyond water. Sports drinks consumed outside of prolonged exercise simply add sugar and calories to your diet without providing a meaningful hydration benefit.
When Sports Drinks Earn Their Place
The clearest case for a sports drink is sustained, vigorous physical activity lasting well beyond an hour: a long-distance run, a competitive soccer match, a cycling race, a multi-hour hike in the heat, or manual labor in hot conditions. In these situations, the combination of carbohydrate for energy and sodium for fluid retention genuinely improves how you feel and perform.
Lower-intensity exercise can also warrant a sports drink if the duration stretches long enough. A four-hour hike at a moderate pace, for instance, still drains electrolytes and burns fuel even though your heart rate never spikes. The key variable is total time and total sweat loss, not just how hard you’re working at any given moment.
The Sugar and Calorie Trade-Off
A standard 12-ounce serving of Gatorade or Powerade contains about 21 grams of sugar and 80 calories. Scale that up to a 20-ounce bottle and you’re looking at roughly 34 grams of sugar, comparable to a can of soda. If you’re burning through it during a two-hour training session, those calories are functional fuel. If you’re sipping one at lunch or after a 20-minute walk, they’re just excess sugar.
Lower-calorie options exist. Some formulations contain as little as 2 grams of sugar per 16-ounce bottle while still providing potassium and a small amount of sodium. These can be a reasonable middle ground for people who want electrolyte support without the full sugar load, though the reduced carbohydrate means less fuel benefit during truly long efforts.
The Dental Erosion Problem
Tooth enamel begins to break down at a pH of about 5.5. Most sports drinks have a pH around 3.3, making them significantly acidic. For comparison, cola sits around 2.2. The acid doesn’t just come from sugar. Citric acid, a common flavoring ingredient, directly dissolves the mineral structure of enamel over time.
Occasional use during long workouts is unlikely to cause significant dental damage. But daily consumption, especially when sipped slowly over extended periods, keeps your mouth in an acidic state that promotes erosion. Drinking through a straw, rinsing with water afterward, and waiting at least 30 minutes before brushing (to avoid scrubbing softened enamel) all help reduce the risk if you do use sports drinks regularly.
Sports Drinks and Kids
The American Academy of Pediatrics is clear on this: for the average child engaged in routine physical activity, sports drinks are unnecessary. Water should be the primary hydration source for children and adolescents. The AAP warns that routine consumption of sports drinks contributes to excessive calorie intake, increases the risk of overweight and obesity, and promotes dental erosion.
The exception mirrors the adult guideline. Young athletes participating in prolonged, vigorous sports, think tournament play with multiple games in a day or extended practice sessions in the heat, may benefit from the carbohydrate and electrolyte replenishment a sports drink provides. But even then, the AAP frames it as a limited, specific-use tool rather than a default beverage. Sports drinks should not replace water or milk at meals or snacks.
Why Sports Drinks Don’t Prevent Hyponatremia
Hyponatremia, a dangerously low blood sodium level, is a real risk during ultra-endurance events like marathons and Ironman races. You might assume that a sodium-containing sports drink would prevent it, but the math doesn’t work out that cleanly. Standard sports drinks contain far less sodium than your blood plasma. Drinking large volumes of any hypotonic fluid, including sports drinks, during exercise steadily dilutes your blood sodium.
The real driver of exercise-associated hyponatremia is overdrinking, consuming more fluid than you’re losing in sweat. Sports drinks slow the decline in blood sodium compared to plain water, but they don’t stop it if you’re drinking excessively. For long endurance events, drinking to thirst rather than forcing fluid on a schedule is a more reliable strategy for keeping sodium levels safe. Some endurance athletes supplement with additional sodium tablets during very long races, but the foundation is still matching fluid intake to actual sweat losses rather than drinking as much as possible.