Physiologically, at this time, the stomach has been basically emptied, and air will make a sound after passing through the gastrointestinal tract.
When people feel hungry, their stomachs are not empty, but there is air and water. In this case, the mutual "pulling" of abdominal muscles will squeeze the water and air inside and make a sound to remind people to eat quickly.
This kind of signal is like the signal of "looking at plums to quench thirst". Nie Cong, a member of the Health Risk Assessment and Control Committee of Chinese Preventive Medicine Association and a doctor of medical psychology of China Academy of Sciences, said that when the stomach contracts and squeezes air and water, it will produce a "goo goo" sound.
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