system
Given the following post, respond as if you're commenting on Reddit:
human
What is the scientific explanation for your stomach rumbling when you're hungry?

It may be a silly question, but I'd just like to know!
gpt
Mass movements are initiated by the large intestine when you aren't active to encourage defecation. It is just rapid movement of the feces toward the anus. It is different from peristalsis, which is a controlled movement used by both the large intestine and small. This usually coincides with the stomach being empty, but not always. Mass movements are sometimes heard and felt, and interpreted as "stomach rumbling"