- See:
Vitamin D Defiency Rickets;
- Discussion:
- following a Polya or Billroth II gastrectomy, osteomalacia develops that was quite subtle and
only revealed itself by increasing muscle weakness or a pathological fracture;
- abnormal fat metabolism, usually associated w/ failure of emulsifying action of bile salts or
presence of free fat in intestinal tract;
- diffuse injury to the wall of small bowel, as occurs with inflammatory processes such as celiac
disease, Crohn disease, or disorders associated with a short loop (shunts or fistulae) or rapid
transit (gluten-sensitive enteropathy and other sprue-like syndromes);
- absorption characteristics:
- approximately 20% of oral calcium is absorbed by the gut under normal conditions;
- requires physiologic gastric acidity and normal bowel and pancreatic funciton;
- substances that interfere w/ calcium absorption:
- excessive fatty acids bind calcium and prevent absorption;
- phytic acids (found in wheat and tea);
- excessive phosphorous (as in soft drinks) binds Ca and prevents absorption;
- oxylates (found in spinach);
- excessive phosphorous (as in soft drinks) binds Ca and prevents absorption;
- excessive fatty acids bind calcium and prevent absorption;
- phytic acids (found in wheat and tea);
