During starvation, cells in the brain, muscles, and kidneys use _____ as a source of energy.

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During starvation, the body shifts from glucose as the primary source of energy to ketones produced by the liver through the breakdown of fatty acids. Ketones can be used by the brain, muscles, and kidneys as an alternative source of energy. Glycogen stores in the liver and muscles are depleted within the first 24-48 hours of fasting, and triglycerides are broken down into fatty acids for ketone production. Glycerol may be used for gluconeogenesis to maintain blood glucose levels, but it is not a significant source of energy for these tissues.

During Starvation, Cells in the Brain, Muscles, and Kidneys Use