This makes sense because most of the pre-exercise meals in these studies provided carbs, which the body used for energy during exercise. Studies show that blood sugar is higher before and during exercise when you eat before working out ( 1, 2).
Your body’s primary sources of fuel are body fat and carbohydrates.įat is stored as triglycerides in fat tissue, while carbs are stored in your muscles and liver as a molecule called glycogen.Ĭarbs are also available in the form of blood sugar. Exercising Fasted Increases Your Body’s Ability to Use Fat for Fuel Studies have shown that your body’s responses to exercise can differ based on whether or not you eat before exercise.
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