Metabolic Fuel Use, 116  Fasting and starvation Preserve glucose for brain and RBC's Preserve glucose for brain and RBC's Days 1-3 Days 1-3 ○ Hepatic glycogenolysis and glucose release ○ Adipose release of free fatty acids, used by muscle and liver (in place of glucose) ○ Hepatic gluconeogenesis from peripheral lactate and alanine, adipose tissue
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