The human digestive system is complex and powerful. It processes what we eat and drink over a length of more than eight metres. But we not only consume food and thus energy for life. With more than 100 million nerve cells in the intestine, the digestive tract is known as our second brain and reacts to unhealthy influences. Fatty foods, a hectic lifestyle, stress or bottled-up problems are often expressed by a sense of nausea, stomach pain or poor appetite.