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

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During the early stages of fasting, the body relies primarily on protein breakdown to provide glucose for energy production. This process is called gluconeogenesis, which literally means "new glucose formation." The amino acids released from protein breakdown are used to synthesize glucose in the liver to maintain blood glucose levels. Rebuilding tissue and replacing worn out cells occur at a slower rate and may rely on the availability of nutrients beyond what is provided by protein breakdown. Stabilizing fluid balance is not directly related to the use of body protein during fasting.

In the First Few Days of Fasting, Body Protein Is