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Skin fairness, red hair both associated with poor health (perhaps low vitamin D) – Dec 2019

Skin fairness is a better predictor for impaired physical and mental health than hair redness.

Sci Rep. 2019 Dec 2;9(1):18138. doi: 10.1038/s41598-019-54662-5.
Flegr J1,2, Sýkorová K3.


Overview Dark Skin and Vitamin D contains the following summary
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 with dark skins
CONCLUSION - - People with dark skins have more health problems due to low levels of vitamin D

African American Health Disparities are associated with low Vitamin D - Feb 2021

Low Vitamin D increases health problems - independent of skin color

Blacks die more often than whites of many diseases (they have less vitamin D) – 2012 contains the following summary
Cancer Facts & Figures for African Americans Cancer.org

  • “African Americans have the highest death rate and shortest survival of any racial and ethnic group in the US for most cancers”
  • Has a huge number of tables and charts, Note: Vitamin D is not mentioned

Leading Causes of Death as of March 2018

All Ages Death rateBlackWhiteRatio
Heart diseases 217 1711.27
Cancer 1991701.17
Cerebrovascular diseases51361.4
Diabetes 40 192.0

Rates per 100,000    Age adjusted   Non-Hispanic

 Download the PDF from VitaminDWiki

RED highlight for those with p value = 0.005 (very likely, normally p = 0.05)


About 1-2% of people of European origin have red hair. Especially female redheads are known to suffer higher pain sensitivity and higher incidence of some disorders, including skin cancer, Parkinson's disease and endometriosis. Recently, an explorative study performed on 7,000 subjects showed that both male and female redheads score worse on many health-related variables and express a higher incidence of cancer. Here, we ran the preregistered study on a population of 4,117 subjects who took part in an anonymous electronic survey. We confirmed that the intensity of hair redness negatively correlated with physical health, mental health, fecundity and sexual desire, and positively with the number of kinds of drugs prescribed by a doctor currently taken, and with reported symptoms of impaired mental health. It also positively correlated with certain neuropsychiatric disorders, most strongly with learning disabilities disorder and phobic disorder in men and general anxiety disorder in women. However, most of these associations disappeared when the darkness of skin was included in the models, suggesting that skin fairness, not hair redness, is responsible for the associations. We discussed two possible explanations for the observed pattern, the first based on vitamin D deficiency due to the avoidance of sunbathing by subjects with sensitive skin, including some redheads, and second based on folic acid depletion in fair skinned subjects, again including some (a different subpopulation of) redheads. It must be emphasized, however, that both of these explanations are only hypothetical as no data on the concentration of vitamin D or folic acid are available for our subjects. Our results, as well as the conclusions of current reviews, suggest that the new empirical studies on the concentration of vitamin D and folic acids in relation to skin and hair pigmentation are urgently needed.

Created by admin. Last Modification: Wednesday December 4, 2019 20:16:43 GMT-0000 by admin. (Version 8)

Attached files

ID Name Comment Uploaded Size Downloads
13092 Health problem vs red and skin.jpg admin 04 Dec, 2019 18:08 87.31 Kb 366
13091 Red hair light skin.jpg admin 04 Dec, 2019 18:07 52.43 Kb 137
13090 Hypothesis skin fairness.pdf PDF 2019 admin 04 Dec, 2019 18:07 1.21 Mb 250
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