Tummy growls are really just internal farts, according to Indiana Public Media's "A Moment of Science."
Basically, the involuntary muscle movements that push food through your digestive tract keep working even after most of that food has moved on down the line. Eventually, gas bubbles are all that's left to be squeezed, and you get a rumbling sound as they pop. It's part of how your intestine keeps itself cleansed—no expensive pills or powders required!
To read the full, original article click on this link: Why does your tummy growl? - Boing Boing
Author: Maggie Koerth-Baker
