Second generation dark skinned immigrants live shorter lives
A chart in by Dr. Grimes in the UK Video June 2011

Note that children from Bangladesh do not die as much as those from Pakistan - with similar skin color
They do not have such concealing clothes - thus getting more vitamin D from the sun
They eat far more fish (which contain vitamin D)
See also VitaminDWiki
Google search VitaminDWiki for Grimes 25 items as of Oct 2011
Disadvantaged have low vitamin D and thus poor health – Aug 2011
Graphs of diseases vs vitamin D levels - and D3 vs D2- April 2011 same presentation