During periods of prolonged fasting in a normal, healthy individual, blood glucose levels are maintained by gluconeogenesis. The carbons utilized for glucose synthesis under these circumstances are derived primarily from

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During prolonged fasting, the body breaks down muscle tissue for amino acids, which can then be used for gluconeogenesis to maintain blood glucose levels. Therefore, the carbons utilized for glucose synthesis primarily come from protein.

During Periods of Prolonged Fasting in a Normal, Healthy Individual