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Carbohydrates (specifically glucose) are the preferred fuel for the human body due to the metabolic pathways used to produce ATP (Adenosine Triphosphate). The body produces ATP by both glycolysis and oxidative phosphorylation and the starting point for this production cycle is glucose. However, both protein and fat can be converted into glucose should carbohydrates be temporarily unavailable. However, in the case of fat, too much oxidation of fat into glucose can cause ketoacidosis.

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