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Sports Nutrition by Kary Woodruff

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Chapter 3

Energy Metabolism

Our bodies require adenine triphosphate (ATP) for muscular contraction, but we do not eat ATP, rather, we consume food. Thus, our bodies need to take the food that we eat and convert it into ATP, which is required for movement. The processes that make up this conversion are collectively referred to as energy metabolism. The three main macronutrients—carbohydrates, protein, and fat—are found in varying quantities in the foods we eat. Macronutrients contain energy, or calories, that can only be used or stored after digestion and absorption. If energy, in the form of ATP, is needed immediately, the body can use the metabolites from the breakdown of macronutrients to meet these needs. The three different energy systems ...

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