What Is Osteitis Fibrosa Cystica?
Osteitis fibrosa cystica is a metabolic bone disease characterized by decalcification and softening of bones with bone cyst formation and bone tumors developing from effects of chronic vitamin D  deficiency causing hyperparathyroidism and parathyroid adenoma (tumor).
Hyperparathyroidism is a sustained elevated parathyroid hormone level in the blood which draws calcium  from bone tissue.
Q: How does vitamin D  deficiency cause hyperparathyroidism?
A: Vitamin D  is required to absorb calcium  from the food we eat. Deficiency of vitamin D  in turn causes deficiency of calcium  to develop. Without adequate calcium  for essential body functions, the pituitary gland stimulates the parathyroid glands to produce parathyroid hormone for the purpose of getting calcium  from bone tissue which is less essential to life.
Unfortunately, the bones become depleted of calcium  and become soft and disfigured.
What Is Osteitis Fibrosa Cystica In Celiac Disease and/or Gluten Sensitivity?
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