The primary effect of sports drinks is to replace water and electrolytes such as sodium and potassium lost during the process of sweating.In addition,sports drinks contain sugars in the from of sucrose,glucose,or fructose which have the function of replacing lost carbohydrate stores and serve as a source of energy during an intense workout.It has been shown that the loss of as little as two percent of your bodily fluid during exercise can result in decreased exercise performance.