WHY YOUR STOMACH GROWL WHEN YOU ARE HUNGRY

Generally speaking stomach growling, or as the Doctors call it today "borborygmi", is the noise created during a series of  muscle contractions in your stomach and small intestine.

The digestive system is one big long tube that begin from your mouth to your butt. Food gets through this long tube via waves of muscle contractions, called peristalsis. These waves of muscle contraction also help to mix and grind foods, liquid, and digestive juices together. The resulting cocktail is called chyme.

The sound you hear when you stomach and intestines make noise is the result of these muscular contractions mixing and moving the chyme down the tube, as well as pushing any resultant air through your system.

The reason your stomach growl more when you are hungry is that, when your stomach and intestines are empty, it triggers a reflexive generation of contraction waves, even though there is nothing in your stomach that needs to move down. These are meant to clear out all of your stomach contents, including the mucus, any remaining food, bacteria, etc. It's your body's way of cleaning and making sure no food or other things accumulates anywhere along your stomach or intestines.

The movement happens almost at all times, but you don't hear it when the stomach is full. So the less content in the stomach the louder the noise is heard.

In order to avoid stomach growling, one just needs to eat.