The component of diet primarily responsible for energy production is carbohydrates. Carbohydrates are broken down into glucose, which serves as the primary fuel source for the body, especially during physical activity. They are essential for optimal brain function and maintaining energy levels throughout the day. While proteins and fats also provide energy, carbohydrates are more readily utilized by the body. A well-balanced diet should include complex carbohydrates from whole grains, fruits, and vegetables to ensure sufficient energy supply, underpinning overall health and fitness performance.