Why does your stomach growl, even when you are not hungry?
That rumble is not your stomach begging for food - it is plumbing.
The growl, called borborygmi, is the sound of gas and liquid being squeezed through your stomach and intestines by waves of muscle contraction. The gut does this all the time. When the stomach is empty, it runs an extra cleaning sweep and there is no food to muffle the noise, so you finally hear it.
Sitting in a quiet meeting at 11am, your belly lets out a loud gurgle - not because you are starving, but because your empty gut is sweeping itself out and the silent room lets the sound escape.
A growl means gas and fluid are moving through your gut, not that your body is out of fuel.
You can stop reading every growl as a hunger emergency and skip the unnecessary snack.
Empty pipe, loud echo - food normally muffles the rumble.
Learn the idea and practice English at the same time.