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Some acetyl-coa is converted to ketone bodies like
Acetone, acetoacetate, beta hydroxybutyrate
When are ketone bodies made and used
When starving and no carbs available for glycolysis and TCA.

Acetyl-coa and thiolase →
Acetoacetyl-CoA

HMG-CoA synthase
3-Hydroxy-3-methylglutaryl-CoA (HMG COA)

HMG-CoA lyase
Acetoacetate + acetyl-coa

Beta-hydroxybutyrate dehydrogenase
Reduces acetoacetate to acetone and beta hydroxybutyrate
What enzymes reconvert ketone bodies to acetyl-coa
Beta-ketoacyl-coa transferase and thiolase