Runner's World: Marathon Fueling Guide: Carb Intake and Hydration for Race Day BBC Sport speaks to two runners with opposing views on the fact there will be no single-use cups or bottles at this weekend's Paris Marathon. Runner's World: Stop Relying on Race Aid Stations During Marathons. Do This, Instead.

Understanding the Context

You can practice all you want, but grabbing and drinking from aid station cups is always going to be a challenge, especially in crowded marathons. Doing it without sacrificing too much time is even ... Thirst isn't always a good way to tell if the body needs water. Many people, mainly older adults, don't feel thirsty until they're dehydrated.

Key Insights

That's why it's important to increase water intake during hot weather or while ill. The symptoms of dehydration can differ by age. The only way to treat dehydration is to replace lost fluids and lost electrolytes. The best way to replace lost fluids depends on age, how bad the dehydration is and its cause. For infants and children who are dehydrated from diarrhea, vomiting or fever, use water with electrolytes such as Pedialyte or Smart Water.

Final Thoughts

Start with about a teaspoon (5 milliliters) every 1 to 5 minutes and increase ...