system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does your stomach sometimes rumble when you are hungry?
gpt
Things inside the stomach are constantly shifting around and moving down the line toward the final stages of digestion. When your stomach is empty or closer to empty, all that movement of material sends out vibrations in the form of sound waves that reverberate more loudly because the acoustics of an empty belly are better than the acoustics of a full one.