In the first few days of fasting, body protein is used primarily to:

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In the first few days of fasting, the body relies on glucose to meet its energy needs. As glucose stores become depleted, the body begins to break down stored glycogen and then turn to amino acids from body proteins to make glucose through a process called gluconeogenesis. This means that the primary use of body protein during fasting is to provide glucose for energy, not to rebuild tissue, replace worn out cells, stabilize fluid balance or provide immunity to infection.

In the First Few Days of Fasting, Body Protein Is