Digestive Enzymes Explained: What They Are Who Needs Them and How They Work
Digestive Enzymes Explained: What They Are, Who Needs Them, and How They Work
By Dr. Onikepe Adegbola, MD PhD — Johns Hopkins-trained physician-scientist and founder of Casa de Sante
Key Takeaways
- Digestive enzymes are proteins that break food molecules into absorbable nutrients. Without them, even a perfect diet cannot be properly utilized by the body.
- Your body produces digestive enzymes from three sources: the salivary glands (amylase), the stomach (pepsin), and the pancreas (the main factory producing lipase, protease, and amylase)
- Enzyme production declines with age (by 60, many people produce significantly less), and conditions like IBS, SIBO, chronic stress, and certain medications further impair production
- FODMAP-specific enzymes (alpha-galactosidase, lactase, xylose isomerase) break down FODMAP carbohydrates before bacteria can ferment them — reducing gas, bloating, and symptoms at the source
How Digestion Actually Works
The Enzyme Cascade
- Mouth: Salivary amylase begins starch digestion. This is why chewing thoroughly matters — more surface area exposure to amylase = better initial carbohydrate breakdown.
- Stomach: Hydrochloric acid (HCl) activates pepsinogen into pepsin, which begins protein digestion. HCl also sterilizes food (kills bacteria). pH must be 1.5-3.5 for optimal activation.
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Small intestine (duodenum): The pancreas releases the major enzyme package:
- Lipase: Digests fats into fatty acids and glycerol
- Protease (trypsin, chymotrypsin): Completes protein digestion into amino acids
- Amylase: Completes carbohydrate digestion
- Elastase: Digests connective tissue proteins
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Small intestine (brush border): The intestinal lining produces brush border enzymes:
- Lactase: Breaks down lactose (milk sugar)
- Sucrase-isomaltase: Breaks down sucrose and maltose
- DPP-IV: Breaks down casein and gluten peptides
When the System Fails
When any point in this cascade is impaired, food arrives in the colon undigested or partially digested. Colonic bacteria then ferment it, producing gas, bloating, diarrhea, and the symptoms of IBS.
Who Needs Enzyme Support
- IBS patients: Visceral hypersensitivity means even normal gas production causes pain. Enzymes reduce gas production at the source.
- People over 50: Natural enzyme production declines with age. Stomach acid decreases (affecting pepsin activation).
- PPI users: Proton pump inhibitors reduce stomach acid, impairing pepsin activation and overall protein digestion.
- Post-gallbladder removal: Without the gallbladder, bile (which helps emulsify fats for lipase) is released continuously in small amounts rather than in a concentrated bolus with meals. Fat digestion suffers.
- Chronic stress sufferers: Stress diverts blood from the GI tract, reducing enzyme secretion.
- SIBO patients: Enzymes ensure food is absorbed in the small intestine before bacteria can ferment it.
- GLP-1 medication users: Delayed gastric emptying means food sits longer in the stomach — enzyme support ensures digestion continues optimally despite altered transit.
FODMAP-Specific Enzymes
Alpha-Galactosidase
Breaks down GOS (galacto-oligosaccharides) found in beans, lentils, cashews, and pistachios. Your body does not produce this enzyme — it is exclusively a bacterial enzyme. That is why beans cause gas in EVERYONE (not just IBS patients). Supplemental alpha-galactosidase prevents the gas before it starts.
Lactase
Breaks down lactose. 65% of the global population has reduced lactase production after childhood. Supplemental lactase allows dairy consumption without symptoms.
Xylose Isomerase (Glucose Isomerase)
Converts excess fructose into glucose. Since glucose-fructose balance determines fructose absorption, this enzyme makes high-fructose foods tolerable.
🛒 Enzyme Solutions
- Digestive Enzymes — Comprehensive enzyme formula including broad-spectrum digestive enzymes (protease, lipase, amylase) PLUS FODMAP-specific enzymes. Designed by a physician-scientist specifically for IBS and GLP-1 patients. Take before meals for complete digestive coverage.
- FODMAP Enzymes + Prebiotics + Probiotics + Postbiotics — FODMAP enzymes combined with the gut health trio. Enzymes prevent acute symptoms while probiotics, prebiotics, and postbiotics address the underlying microbiome imbalance that contributes to enzyme insufficiency.
Medical Disclaimer: This article is for educational purposes only. If you suspect pancreatic enzyme insufficiency (steatorrhea, significant weight loss, severe malabsorption), see your doctor — this may require prescription-strength pancreatic enzyme replacement therapy (PERT). Dr. Adegbola is the founder of Casa de Sante.
