Malabsorption problems

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Cholestatic Liver disease/ Biliary atresia
Bile salts do not enter the duodenum leading to deficiency of fat and fat soluble nutrients

Lymphatic leakage obstruction
Failure of chylomicrons to reach systemic circulation

Short Bowel Syndrome
From anything that cause removing part of the small bowel, causing nutrient/ water/ electrolyte deficiency

Loss of Terminal ileum function
From resection/ crohn's leading to no bile acid or vit B12 absorption

Exocrine pancreatic dysfunction
From Cystic Fibrosis

There is no lipase, protease or amylase. This causes a defective digestion of triglycerides, protein and starch. (pannutrient deficient)

Small intestinal mucosal disease
Caused by:
 * Loss of absorptive surface e.g. Coeliac's
 * Specific enzyme defect
 * Specific transport defect