system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How a "growling" stomach is linked to our hunger?
gpt
When the stomach has no food in it, it will cycle out the old mixture of acid and enzymes in order to add new, fresh stomach juice. This only happens all at once when you have no food in your stomach, and the amplification of the sound by your empty stomach doesn't hurt either. Thus the growling noise used to indicate hunger by all manner of fiction, especially in visual media.