Digestive System Diagram Labeled | Organs & Anatomy Printout Digestion is the process of ingesting and digesting food. The food that is absorbed releases nutrients into our body, while the indigestible food components are excreted. There are six steps involved in digestion. They are: 1. Ingestion 2. Motility 3. Mechanical digestion 4. Chemical Digestion 5. Absorption 6. Defecation