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How can intestinal diseases interfere with nutrient absorption?
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nutritional disease
Children with rickets. The disease, which most commonly strikes children, causes bone deformities such as bowlegs. Rickets is caused by a lack of vitamin D or calcium.
Intestinal diseases interfere with nutrient absorption by disrupting the complex processes required to transport digested materials from the intestinal lumen into the body’s circulatory or lymphatic systems. This interference typically occurs through several mechanisms:1
- Reduction of Absorptive Surface: Conditions like celiac disease and tropical sprue cause atrophy of the intestinal mucosa, leading to the loss of villi and microvilli. This significantly diminishes the surface area available for nutrient uptake.234
- Cellular and Enzymatic Defects: Malabsorption can occur if intestinal cells lack necessary enzymes or if there is a congenital or acquired defect in transport proteins.1
- Physical and Environmental Obstruction: Diseases may infiltrate tissues, disturb normal intestinal motility, or cause bacterial overgrowth, which hinders the work of absorptive cells. Furthermore, obstructions in the bile ducts or lymphatic vessels can block the pathways required for nutrient transport.14
- Secondary Factors: Conditions such as pancreatitis or cystic fibrosis prevent essential digestive enzymes from reaching the intestine, while surgical removal of bowel sections (short-bowel syndrome) directly reduces the capacity for absorption.14