Which macronutrient serves as the primary fuel during exercise?

Carbohydrates serve as the primary fuel during exercise because they are the body's preferred source of energy, especially during high-intensity workouts. When you engage in physical activity, your body breaks down carbohydrates into glucose, which is then used for immediate energy needs through a process called glycolysis. This is essential for activities that require quick bursts of energy, like sprinting or heavy lifting.

While sugars are a type of carbohydrate, the term "carbohydrates" encompasses a broader range of compounds, including starches and fiber, which are also important for energy production. Proteins primarily serve as building blocks for muscles and are not typically used as a primary energy source during exercise; instead, they are utilized more during prolonged activity when carbohydrate stores are depleted. Minerals, while vital for overall health and metabolic processes, do not serve as fuel sources for energy during exercise. Thus, carbohydrates are crucial for sustaining energy levels during physical activity, making them the primary macronutrient for this purpose.