Final answer:
Ketosis is a condition characterized by an increase in ketone bodies in the blood and urine. It occurs when there is an excess accumulation of ketone bodies in the blood (ketonemia) followed by their excretion in the urine (ketonuria).
Step-by-step explanation:
Ketosis is a condition characterized by an increase in ketone bodies in the blood and urine. It occurs when there is an excess accumulation of ketone bodies in the blood (ketonemia) followed by their excretion in the urine (ketonuria). Ketosis is primarily caused by the increased production of ketone bodies, such as acetoacetic acid and beta-hydroxybutyric acid, due to the oxidation of fatty acids when glucose levels are low.