A recent excerpt from the NY Times regarding a study published online in The Lancet. nyti.ms/1gnT1vz
In a large review of studies, researchers have found almost no evidence that taking vitamin D supplements has any effect in preventing osteoporosis in middle-aged adults.
The analysis…included 23 randomized trials that measured the effect of vitamin D on bone density at four sites — spine, neck, hip and forearm — and included more than 4,000 generally healthy participants whose average age was 59.
The studies used dosages that varied from 500 units a day to 800 or more, given on varying schedules. In some studies, the subjects were given calcium as well.
Neither the pooled data nor any single study showed a significant increase in bone density across all four sites….The authors write that the widely believed idea that vitamin D promotes bone mineralization is probably incorrect.
“We’re not talking about people who are really vitamin D deficient,” said the lead author, Dr. Ian R. Reid, a professor of medicine at the University of Auckland in New Zealand. “But for healthy people focused on osteoporosis prevention, vitamin D does not make a positive contribution.”