Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed. Generation of energy from the food is one of our livelihoods. To the food slurry that has been predigested in the stomach, secretions from the bile and the pancreas are added within the duodenum. Enzymes decompose the slurry into small molecules. Billions of minute villi enlarge the surface of the duodenum. In this section of the intestinal tract carbohydrates, proteins and fats are resorbed. Uncountable complex biochemical processes are fine-tuned to work precisely together. The wavelike transport of the food slurry in the gut takes place largely independently from the governance of our brain. This so called peristaltic reflex is triggered and sustained by the gut brain. The digestive system is dominated by about 100 million neurons that are embedded in the intestinal wall. They represent the area with the second highest density of nerve cells in the human body. In this mighty neuronal control center not only the gut contents are constantly analyzed but also the delicate equilibria of inhibitory and excitatory messenger substances are controlled. As a result the head-brain is also involved in these processes.