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  1. Dec 2018
    1. To reduce the urinary loss of these important metabolicfuels, which furnish a significant amount of the caloric re-quirements during fasting, the kidney is capable of reab-sorbing a portion of the increased filtered load of ketoacids.A linear correlation has been found between the urinaryexcretion of acetoacetate and the plasma concentration, oncethe renal threshold has been exceeded.

      This seems to indicate that when the body no longer needs ketones it will excrete the excess via the urine.