Which macronutrient is the primary source of energy for endurance activities?

Carbohydrates are recognized as the primary source of energy for endurance activities because they are rapidly metabolized to provide glucose, which is crucial for energy production during prolonged physical exertion. When engaging in endurance sports, the body primarily relies on stored carbohydrates in the form of glycogen in the muscles and liver.

This readily available energy source supports sustained high-intensity effort, as it can be quickly mobilized during exercise. Additionally, carbohydrates help replenish energy stores post-exercise, aiding in recovery. While fats can also be utilized for energy during extended workouts, their conversion to usable energy is slower compared to carbohydrates, making them less efficient for immediate energy needs during endurance activities. Proteins generally serve more for repair and recovery rather than a primary energy source, and vitamins do not provide energy directly, as they are micronutrients that assist in metabolic processes. This focus on carbohydrates as the main energy contributor underscores their significance in nutrition strategies for endurance athletes.