Ketogenic diet, when the human body ingests glucose, the liver converts glucose into glycogen for storage, which can meet the glucose supply of about 12 hours. When all the carbohydrates in a meal are digested, the liver begins to convert the stored glycogen into glucose and release it into the blood to maintain blood sugar balance.

At this time, the body has lipolysis, and it also begins to decompose fat in fat cells and release fatty acids into the blood. Burning fatty acids without using glucose as energy tissue can reduce the demand for glucose and ensure that nerve cells can obtain glucose.

When glycogen in the liver is exhausted, the liver turns to a process called gluconeogenesis, which converts amino acids into glucose. Subsequently, the liver began to synthesize ketone bodies from fatty acids released into the blood through lipid interpretation, and the brain and nerve cells changed from simple glucose consumers to partial ketone body consumers to obtain energy.