People with dark skins often have low vitamin D and poor health

FACT:: People with dark skins have more health problems and higher mortality rate than those with light skins
FACT:: People with dark skins have low levels of vitamin D
FACT:: People with light skins who have low vitamin D have health problems
OBSERVATION: The health problems of whites with low level of vitamin D are similar to those of blacks - both in kind and amount
CONCLUSION: People with dark skins have more health problems due to low levels of vitamin D

The support references are at THIS WEB PAGE
People with dark skins are generally 10X more likely to be deficient than those with white skins
30X or more if in addition to dark skin the person is in one of the following high risk categories
obese, elderly, wear lots of clothes, avoid the sun, have poor gut absorption, live far from equator, . . .

Some of the images at that web page

The percentage of blacks with low vitamin D is 10X that of whites

Where deficiency is < 17.8 ng

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Virtually everyone with dark skins is vitamin D deficient = Colored RED