Digestive enzymes are biological catalysts that break down complex food molecules into simpler, absorbable forms. Secreted by various glands and organs, these enzymes ensure efficient digestion in the mouth, stomach, and small intestine.

• In the mouth, salivary amylase begins carbohydrate digestion by breaking starch into maltose.

• In the stomach, pepsin, activated by hydrochloric acid, begins the breakdown of proteins into peptides.

• In the pancreas, multiple enzymes are produced:

  • Trypsin and chymotrypsin continue protein digestion.

  • Amylase continues carbohydrate breakdown.

  • Lipase breaks down fats into fatty acids and glycerol.

These enzymes are secreted into the duodenum, where:

• Maltase, lactase, and sucrase on the intestinal walls break down disaccharides into glucose, fructose, and galactose.

• Peptidases finish breaking proteins into amino acids.

The importance of enzymes lies in:

• Efficiency: They speed up digestion, allowing nutrients to be absorbed quickly.

• Specificity: Each enzyme targets a specific macronutrient, ensuring precision.

• Control: Enzymes work in pH-specific environments, ensuring they're active only where needed.

Without enzymes, digestion would be too slow to meet the body’s nutritional needs. Enzyme deficiencies can lead to malabsorption and diseases like lactose intolerance or pancreatic insufficiency.