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Three nutrients are responsible for providing your body with energy, or calories—carbohydrate, protein, and fat. Because you need relatively large amounts of these nutrients, they are called macronutrients. Each of the macronutrients has specific functions in your body, but in some cases, one can be interchanged with another. A perfect example of this takes place during exercise. Working muscles prefer to use carbohydrates for energy, but in a pinch (if you haven’t eaten enough carbohydraterich foods or if you’ve exhausted the supply in your muscles), fat can provide energy as well. Read on to discover how your body depends on each of these important nutrients!

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