By Cameron Delaney Updated Aug 30, 2022
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Chemical digestion is the process by which acids, enzymes, and secretions break down food into absorbable nutrients. While the journey starts in the mouth, the majority of enzymatic activity takes place in the small intestine.
Mechanical digestion—chewing and stomach churning—prepares food for enzymatic action.
Salivary amylase begins carbohydrate breakdown.
Hydrochloric acid creates an acidic environment; pepsin initiates protein digestion.
Pancreatic enzymes and bile salts further break down carbohydrates, proteins, and fats. The duodenum is the primary site.
Chemical digestion converts macronutrients into sugars, amino acids, and fatty acids that the body can absorb and use for energy, growth, and repair.
