During the first few days of starvation, the brain obtains glucose that is produced from
a. glycogen via glycolysis.
b. fatty acids via lipogenesis.
c. amino acids via gluconeogenesis.
d. branched-chain amino acids via deamina-tion.
C
During starvation, after glycogen stores are depleted (after 8 to 12 hours), the body uses protein from muscle to produce glucose via gluconeogenesis. Glycolysis is part of the process used to obtain energy from glucose. Lipogenesis is the process by which the body forms fat from excess fatty acids and glycerol. Deamination is the first part of the process of using amino acids to form glucose via gluconeogenesis; all amino acids can be used to form glucose, not just branched chain amino acids.
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