Under conditions of fasting, glycogen stores are depleted, and muscle is broken down to provide amino acids for energy and

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During fasting, when glycogen stores are depleted, the body breaks down muscle tissue to provide amino acids. These amino acids are then used in gluconeogenesis, a metabolic pathway that generates glucose from non-carbohydrate substrates, to maintain blood glucose levels and supply energy, especially to the brain and red blood cells.

Under Conditions of Fasting, Glycogen Stores Are Depleted, and Muscle