Might vitamin D deficiency directly cause bone problems 2008
Bone. 2008 Jun;42(6):1021-4. Epub 2008 Feb 9.
Misconceptions - vitamin D insufficiency causes malabsorption of calcium.
Need AG, Nordin BE.
The Division of Clinical Biochemistry, Institute of Medical and Veterinary Science, the Department of Medicine, University of Adelaide and the Hanson Institute, Adelaide, South Australia 5000, Australia. allan.need@imvs.sa.gov.au
The negative effect of vitamin D insufficiency on bone is commonly attributed to a decrease in calcium absorption although little evidence has been produced to support this assumption. Using two previously published series of elderly patients we refute this common assumption and present evidence that low circulating levels of 25 hydroxyvitamin D have a direct and deleterious effect on bone.

PMID: 18343737 [PubMed - indexed for MEDLINE]