Leiden Longevity Study described at Vitamin D Council
Looked at people >89 and their children and used their partners as controls
For the kids of the seniors who were 90+ and had
64 nmol vs 69 nmol for controls (partners)
2X as many study as controls (why? Should be about equal)
Average age of kids: 59
Whites only
Did not measure tanning bed nor sun
Looking carefully: Kids who were offspring of the parents who were > 90 had 4 nmol lower vitamin D level than their spouses.
Possible conclusion from this data include:
- If your parent lives a long time, you have a behavior that keeps you indoors more
- If your parent lives a long time, your genes allow you to not need as high level of vitamin D in your blood
How much more IU of vitamin D is needed to typically increase blood level by 4 nnmol?
27 ng: 8 ng per 1000 IU
4nmol = 1.6 ng = 200 IU