Which nutrient is primarily responsible for energy during high-intensity workouts?

Carbohydrates are the primary nutrient responsible for providing energy during high-intensity workouts. When engaging in activities that require short bursts of intense effort, such as sprinting or weightlifting, the body relies heavily on glycogen, which is stored in the muscles and liver. Glycogen is derived from carbohydrates and can be rapidly broken down into glucose, supplying the necessary energy to fuel muscular contractions and maintain performance.

In contrast, fats serve as a more significant energy source during lower-intensity and prolonged activities, as they require more oxygen for metabolism and take longer to convert into usable energy. Proteins play a crucial role in muscle repair and growth but are not a primary energy source during high-intensity exercise. Vitamins, while essential for overall health and metabolic processes, do not provide energy directly but support various functions that can affect performance. Therefore, carbohydrates are crucial for sustaining energy during high-intensity physical activities.