In the presence of sufficient calcium, the cause of rickets is hypophosphatemia:
http://www.ncbi.nlm.nih.gov/entrez/q...=pubmed_DocSum
http://www.ncbi.nlm.nih.gov/entrez/q...=pubmed_docsum
"Dr. Marshall wrote the author, asking what evidence there is to back the statements in that paper that Vitamin D helps the gut absorb calcium. The reply he received said:
'We have no data that 1,25 has any effect on the prevention of rickets ..
Absence of ligand or receptor in the presence of normal mineral ions leads to a normal growth..'"
"Dr. Marshall did note that 'the VDR does transcribe CASR and PTH and TRPV5 and TRPV6, all of which are active in calcium homeostasis.'"
http://www.marshallprotocol.com/forum39/8687.html