What concept supports altering total energy and carbohydrate intake based on specific training demands?

The concept of "fueling for the work required" highlights the importance of adjusting energy and carbohydrate intake in alignment with an individual's training demands. This approach recognizes that different types of training—such as endurance versus strength training—have varying energy requirements. By modifying carbohydrate intake, athletes can ensure they have sufficient glycogen stores for optimal performance and recovery, which directly supports the demands of their training regimen.

This method allows for a more tailored nutritional strategy, ensuring that athletes are consuming enough calories and carbohydrates to support the intensity and duration of their workouts. It also helps in preventing fatigue and enhancing recovery, as fueling appropriately can lead to improved training outcomes. Thus, this concept is foundational for athletes looking to maximize their performance through nutrition, making it the correct choice in this scenario.