Management of Fat Malabsorption

Diagnosis and Assessment

• Fat malabsorption presents with steatorrhea, weight loss, bloating, excessive flatulence, fat-soluble vitamin deficiencies, and protein-calorie malnutrition 1
• Fecal elastase test is the most appropriate initial diagnostic test, with levels <100 mg/g of stool providing good evidence of exocrine pancreatic insufficiency (EPI) 1
• Quantitative fecal fat testing is rarely needed but must be performed while on a high-fat diet if used 1

Primary Treatment: Pancreatic Enzyme Replacement Therapy (PERT)

• PERT is the cornerstone of treatment for fat malabsorption due to exocrine pancreatic insufficiency 1
• PERT should be taken during meals, not before or after, for optimal efficacy 1

Dietary Modifications

• Low to moderate fat diet with frequent smaller meals is recommended 1
• Very low-fat diets should be avoided as they may lead to essential fatty acid deficiency 2
• In patients with hyperoxaluria, a diet low in fat and oxalate but high in calcium is recommended 3, 4, 5
• For patients with a preserved colon, a diet high in carbohydrates and normal in fat is recommended to increase energy absorption and reduce risk of renal stones 2

Adjunctive Treatments

• Acid suppression therapy with proton pump inhibitors or H2-blockers may be required with non-enteric-coated PERT preparations 1
• Acid suppression may help prevent denaturation of both endogenous and administered enzymes in chronic pancreatitis 6, 7
• Bile acid sequestrants like cholestyramine can be used for mild bile acid diarrhea 3, 4, 5

Nutritional Supplementation

• Routine supplementation and monitoring of fat-soluble vitamin levels (A, D, E, K) is appropriate 1
• For patients with essential fatty acid deficiency, sunflower oil may be rubbed into the skin 2
• Calcium supplementation may be beneficial, especially in patients with hyperoxaluria 3, 4, 5

Special Considerations

• In patients with intestinal strictures, a diet with adapted texture or nutritious fluids may be necessary 3, 4, 5
• For patients with small intestinal bacterial overgrowth (SIBO), antibiotics may be required 6, 7

Monitoring Treatment Success

• Reduction in steatorrhea and associated gastrointestinal symptoms 1
• Weight gain, improved muscle mass and function 1
• Improvement in fat-soluble vitamin levels 1
• Baseline measurements should include body mass index, quality-of-life measures, fat-soluble vitamin levels, and dual-energy x-ray absorptiometry scan (to be repeated every 1-2 years) 1