Which nutrient serves as the main source of energy for high-intensity exercises?

Carbohydrates serve as the primary source of energy for high-intensity exercises because they are quickly broken down into glucose, which can be utilized by the muscles during strenuous activities. During high-intensity workouts, the body requires immediate energy, and carbohydrates can provide it rapidly through glycolysis. This process allows for fast energy production without the need for oxygen, making it particularly effective during short bursts of intense exertion, such as sprinting or weightlifting.

Proteins primarily function in the body for growth, repair, and maintenance of tissues and are not typically used as a primary energy source during high-intensity activities. Fats can provide energy, especially during lower-intensity, longer-duration exercises, but their metabolization takes longer, making them less efficient for immediate energy needs. Vitamins are essential for various metabolic processes but do not serve as direct energy sources. Therefore, carbohydrates are crucial for performance in high-intensity workouts, solidifying their role as the main energy source in this context.