<prompt> Answer this question truthfullyWhat are the effects of a Vitamin D deficiency?  <response>: <reason> Vitamin D deficiency may be caused by: Inadequate vitamin D skin production Inadequate vitamin D dietary intake Vitamin D loss Malabsorption Impaired metabolism Resistance to Vitamin D MedicationAntiepileptic medication Glucocorticoid Inadequate sun exposure including dark skin and clothing Inadequate vitamin D dietary intake MalabsorptionAutosomal dominant hypophosphatemic rickets Celiac disease Chronic kidney disease: impaired renal 1α-hydroxylation Crohn disease Cystic fibrosis Highly active antiretroviral therapy HAART Hyperthyroidism Impaired enterohepatic circulation Nephrotic syndrome Post gastric bypass surgery Primary hyperparathyroidism Rifampin Sarcoidosis Severe liver failure: impaired hepatic 25-hydroxylation Short bowel syndrome St Johns wort Tuberculosis Type I hereditary vitamin Ddependent rickets Type II hereditary vitamin Ddependent rickets Vitamin D-resistant rickets Whipple disease X-linked familial hypophosphatemiaAutosomal dominant hypophosphatemic rickets Carbamazepine Celiac disease Chronic kidney disease Crohns disease Cystic fibrosis Glucocorticoid Highly active antiretroviral therapy HAART Hyperthyroidism Impaired enterohepatic circulation Inadequate sun exposure Inadequate vitamin D dietary intake Nephrotic syndrome Phenobarbital Phenytoin Post gastric bypass surgery Primary hyperparathyroidism Primidone Rifampin Sarcoidosis Severe liver failure Short bowel syndrome St Johns wort Tuberculosis Type I hereditary vitamin Ddependent rickets Type II hereditary vitamin Ddependent rickets Valproate Vitamin D-resistant rickets Whipples disease X-linked familial hypophosphatemia 