Digestive Enzymes

What Are Digestive Enzymes?

Digestive enzymes are biological catalysts — primarily proteins — that break down food macromolecules into smaller units that can be absorbed across the intestinal epithelium and used by the body. The process of mechanical and chemical digestion begins in the mouth and continues through the stomach and small intestine, with different enzymes targeting specific macronutrients at each stage. Without adequate digestive enzyme activity, nutrients pass through the gut unabsorbed, potentially leading to malnutrition and gastrointestinal symptoms.

Major Classes of Digestive Enzymes

Enzyme Deficiencies and Supplementation

Clinically significant enzyme deficiencies are well-documented. Lactase deficiency — the most common enzyme deficiency worldwide — leads to lactose malabsorption, causing bloating, flatulence, and diarrhea after dairy consumption. Exocrine pancreatic insufficiency (EPI), seen in conditions such as chronic pancreatitis and cystic fibrosis, impairs digestion of all macronutrients and requires prescription-grade pancreatic enzyme replacement therapy (PERT).

Over-the-counter digestive enzyme supplements containing amylase, protease, and lipase are widely marketed for general digestive discomfort. Evidence supporting their use in healthy individuals without documented deficiency is limited. Plant-derived enzymes such as bromelain (from pineapple) and papain (from papaya) have proteolytic activity but cannot substitute for endogenous pancreatic enzymes in cases of true insufficiency.