The researchers used genetic manipulation to enable the mice to metabolize glucose and fatty acids, but not acetic acid, and then compared how these rats differed from normal rats when they were fed with food and fasted for 48 hours. In the state of being forced to fast for a long time, the body temperature and endurance of experimental mice that cannot metabolize acetic acid are significantly reduced. Acetic acid is the basic substance in life, and the body structure of experimental mice is very close to the human body. From this:. ["Acetic acid plays a vital role in maintaining the body's energy supply.", 'Acetic acid can be used as an energy source that does not raise blood sugar.', 'Adenosine triphosphate produced by metabolism is the energy source of life activities.', 'Fatty acids and ketone bodies are the main sources of ATP during prolonged exercise.']