what fuel source does carbs use
When you consume carbohydrates, your body breaks them down into a single sugar called glucose, which enters the bloodstream and travels to muscles and organs that use the glucose for energy.uel for Exercise. Your body typically uses protein for fuel as a last resort. During exercise, as during rest, a combination of fat and carbohydrates generally provide the necessary fuel. The intensity and duration of your exercise sessions affect the percentage of energy used from carbohydrates and fat.