Ketone production is the result of:

• A. Glucose metabolism in the brain.
• B. Protein breakdown with amino acids.
• C. Fat metabolism when glucose is unavailable.
• D. Ketone production only with dehydration.

Answer: (C)

Ketone production happens when the body switches to using fat for fuel because glucose isn’t readily available. When glucose is scarce, fat is broken down in the liver, and the resulting fatty acids are converted into ketone bodies. These ketones can then be used by the brain and other tissues for energy, providing an alternative to glucose during fasting or carbohydrate shortage.

That’s why the best choice is fat metabolism when glucose is unavailable. Glucose metabolism in the brain uses glucose directly rather than producing ketones. Protein breakdown with amino acids mainly feeds gluconeogenesis and energy needs rather than creating ketones. Ketone production isn’t something that only occurs with dehydration.