Healthy bones regenerate by absorbing calcium and phosphate continuously with the help of vitamin D. In the absence of vitamin D, bones become brittle. This often happens in old age, when the skin starts to lose its ability to produce vitamin D from the energy in sunlight. This is why three-quarters of all fractures occur in people over the age of 65. This age category is growing fast in Europe, and we are likely to see the number of hip fractures double by 2050.
The group working with Bischoff-Ferrari demonstrated a dose-effect relationship that had hitherto been disputed. They found that vitamin D only has a protective effect if it is taken in large enough quantities. The risk of a hip fracture was thirty percent lower in people who had taken at least 800 international units (IU) of vitamin D every day.
MEDICA.de; Source: Swiss National Science Foundation