The Optimal Sports Drink
The optimal sports drink for endurance events requires 6-10% carb concentration, with 10% being best. By definition a 10% drink means it has 10 grams of carbs per 100 ml (or 3.38 oz). A standard bottle of Gatorade is 591 ml (20 oz), and contains 34 grams of carbs. Dividing 34 grams / 591 ml, you get 5.75%. The math can be cumbersome, but quite relevant. It unfortunately means that typical sports drinks offered at races fall slightly short of the fueling needs of runners.