The process of digestion in the human body can be broadly divided into 4 stages: ingestion, mechanical and chemical digestion, nutrient absorption, and elimination of indigestible waste.

1.  Ingestion: The first stage of digestion begins in the mouth, where food is taken in and mechanically broken down by chewing.
    
2.  Mechanical and Chemical Digestion: The chewed food is then mixed with saliva and transported to the stomach through the esophagus. In the stomach, it is mixed with digestive juices that break down the food further, both mechanically and chemically.
    
3.  Nutrient Absorption: After being broken down in the stomach, the partially digested food (chyme) moves into the small intestine where the majority of nutrient absorption occurs through the walls of the small intestine into the bloodstream.
    
4.  Elimination of Indigestible Waste: The indigestible waste products are then moved into the large intestine, where water and electrolytes are absorbed and the remaining waste is eliminated through defecation.
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