We all know that our digestive systems can make gurgles and other noises, often at the most embarrassing moments. And there are plenty of other digestive activities going on that we might prefer to keep private, too! But what actually happens inside, once you have eaten that sandwich for lunch? Why does your tummy sometimes rumble like there is something growling inside you? Read on to unravel the mysteries of your digestive system, and find out the tips for what to eat and what not to eat to keep your body working as well as it can.