DACBN Practice Questions - Diplomate, American Clinical Board Of Nutrition Exam

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A patient asks why their dietitian recommended carbohydrate before a long run instead of more fat. Which physiologic principle BEST explains this advice for high-intensity endurance work?

Fat oxidation rates are too slow to fully fuel intensities above ~75% VO2max Carbohydrate stores in the liver alone can fuel a marathon Beta-oxidation does not occur during exercise Protein becomes the primary fuel above 70% VO2max

Correct Answer:

Fat oxidation rates are too slow to fully fuel intensities above ~75% VO2max

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