Metabolic flow is based on anabolic and catabolic reactions. Metabolism begins with the ingestion of food that is foreign to the organism (containing a varying amount of smaller and larger compounds), which is broken down in the digestive tract to smaller molecules by hydrolysisAn anabolic phase occurs when the smaller molecules are taken up into the organism's bloodstream and become part of the organism. Catabolic reactions constantly break down the organism again for its functional needs. We will demonstrate the connections of processes in organs and organisms as well as the interconnectedness of organisms within the whole of living nature. Carbohydrates, proteins, and lipids are primary nutritional ingredients for humans. The breakdown of nutrients (carbohydrates, proteins and lipids) in the intestines results in small compounds (metabolites) that can pass through the wall of the intestines into the blood. Complex carbohydrates and proteins are polymers that break up into a large number of smaller similar compounds, the monomers. Lipids do not have monomer and polymer forms.