Malabsorption – Causes, Symptoms and Treatment
Malabsorption occurs when the intestine fails to absorb nutrients properly, potentially leading to deficiencies and a wide range of health issues.
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Malabsorption occurs when the intestine fails to absorb nutrients properly, potentially leading to deficiencies and a wide range of health issues.
What is Malabsorption?
Malabsorption refers to the impaired or insufficient absorption of nutrients, vitamins, minerals, or fluids from the gastrointestinal tract into the bloodstream. Under normal circumstances, most nutrients are absorbed in the small intestine. When this process is disrupted, essential substances such as proteins, carbohydrates, fats, vitamins, and trace elements can no longer be adequately utilized by the body.
Causes
Malabsorption can result from a wide range of conditions, broadly categorized as structural, enzymatic, or inflammatory in nature:
- Celiac disease: An autoimmune condition in which gluten damages the lining of the small intestine, severely reducing its absorptive surface.
- Crohn disease: A chronic inflammatory bowel disease that can affect multiple segments of the digestive tract.
- Lactase deficiency: Insufficient production of the enzyme lactase leads to impaired carbohydrate absorption, particularly of lactose.
- Short bowel syndrome: Surgical removal of a large portion of the small intestine reduces the available absorptive surface area.
- Exocrine pancreatic insufficiency: The pancreas fails to produce adequate digestive enzymes, impairing the breakdown of food.
- Chronic infections or parasitic infestations: For example, infection with Giardia lamblia or other intestinal parasites.
- Medications: Certain drugs can damage the intestinal lining or interfere with nutrient uptake.
Symptoms
The symptoms of malabsorption are diverse and depend on which nutrients are affected. Common manifestations include:
- Chronic diarrhea or greasy, pale, foul-smelling stools (steatorrhea)
- Abdominal cramps, bloating, and a sense of fullness
- Unintentional weight loss
- Fatigue and general weakness
- Nutritional deficiencies such as anemia, osteoporosis, or vitamin deficiencies
- Edema (fluid retention) due to low protein levels
- Delayed growth and development in children
Diagnosis
Several diagnostic approaches are available to identify and evaluate malabsorption:
- Blood tests: Measurement of nutrient levels such as vitamin B12, iron, folate, albumin, and calcium
- Stool analysis: Detection of undigested fats (Sudan stain test) or infectious agents
- Breath tests: Such as the lactose breath test or hydrogen breath test to assess carbohydrate malabsorption
- Endoscopy with biopsy: Examination of the small intestinal mucosa, particularly when celiac disease is suspected
- Imaging studies: Ultrasound, CT, or MRI of the abdomen to assess bowel structure and pancreatic function
- Fecal elastase test: Used to diagnose exocrine pancreatic insufficiency
Treatment
Treatment of malabsorption always targets the underlying cause:
- Celiac disease: Lifelong adherence to a strict gluten-free diet
- Lactase deficiency: Avoidance of lactose-containing foods or use of lactase enzyme supplements
- Exocrine pancreatic insufficiency: Enzyme replacement therapy with pancreatin
- Crohn disease: Anti-inflammatory medications and, if necessary, surgical intervention
- Correction of deficiencies: Targeted supplementation of vitamins, minerals, and trace elements
- Parenteral nutrition: In severe cases of malabsorption, intravenous nutrient delivery may be required
References
- Longo DL et al. (eds.) - Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill Education (2022)
- American Gastroenterological Association (AGA) - Clinical Practice Guidelines on Malabsorption, available at: www.gastro.org
- World Health Organization (WHO) - Malnutrition and Malabsorption: Key Facts, available at: www.who.int
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Related search terms: Malabsorption + Malabsorption syndrome + Malabsorption disorder