The three macronutrients that provide energy are carbohydrates, proteins, and fats. Each plays a unique role in the body: carbohydrates serve as the primary energy source, proteins are vital for tissue growth and repair, and fats provide a concentrated energy source and support cell structure. During exercise, the body utilizes these macronutrients differently depending on the intensity and duration of the activity. Balancing intake from all three macronutrients ensures that individuals have the energy and nutrients necessary for optimal performance, recovery, and overall health.