11. The ketone bodies pass into the brain and replace glucose as an energy source. 12. This is followed by " ketonuria " excretion of ketone bodies in urine. 13. Reduced insulin levels induce " lipolysis ", which consumes fat to produce ketone bodies . 14. :: See User talk : Fvasconcellos # ketone bodies . 15. After fasting for 3 days, the brain gets 30 % of its energy from ketone bodies . 16. When even the glycerol reserves are depleted, or sooner, the liver will start producing ketone bodies . 17. During prolonged periods of fasting, ketone bodies serve as the primary energy source for the brain. 18. The ketone bodies are possibly anticonvulsant in themselves; in animal models, acetoacetate and acetone protect against seizures. 19. Elevated levels of ammonia, glycine, and ketone bodies may also be present in the blood and urine. 20. This is important because succinyl CoA is an intermediate necessary for porphyrin, heme, and ketone body biosynthesis.
