Sports Drinks: When They Help and When You Are Just Drinking Flavoured Sugar
Sports drinks are genuinely useful for specific scenarios. For most casual exercisers, they are unnecessary and calorically counterproductive. Here is the evidence for when each approach is right.
What Sports Drinks Actually Contain
A standard isotonic sports drink (like Gatorade or Lucozade Sport) contains: 6-8% carbohydrate (approximately 30-50g per 500ml), electrolytes (primarily sodium, potassium, and chloride), and water. The formulation is designed to match blood osmolarity for rapid absorption and provide a rapidly available carbohydrate source during sustained exercise.
When Sports Drinks Are Evidence-Backed
- Exercise lasting 60-90+ minutes at moderate-high intensity: Below this threshold, glycogen stores are not significantly depleted and fluid losses are manageable with water.
- Hot or humid conditions: Higher sweat rates increase sodium loss; replacing it prevents hyponatraemia (dangerously low sodium from drinking plain water in excess).
- Multiple training sessions in one day: Rapid carbohydrate and electrolyte restoration supports the second session.
- Endurance competition: Marathons, triathlons, long-distance cycling - where carbohydrate delivery during the event significantly affects performance.
"For a 45-minute gym session, a sports drink provides carbohydrate and calories you did not burn and do not need. Water is better. For a 2-hour run in heat, the calculation is entirely different." - Louise Burke, sports nutritionist
When Sports Drinks Are Not Needed
- Exercise under 60 minutes at moderate intensity
- Casual gym sessions or recreational activity in cool conditions
- Weight management goals where the extra 150-200 kcal per bottle matters
Sports Drinks in Practice
Use the 60-minute threshold as your guide. Under 60 minutes: water is sufficient for the majority of training sessions. Over 60 minutes of sustained moderate-high intensity: an isotonic drink or equivalent carbohydrate with electrolytes is genuinely performance-supporting. Consider coconut water as a lower-sugar alternative with naturally occurring electrolytes for recovery scenarios that do not require high-dose carbohydrate delivery.
