Nina Jablonski, professor of anthropology at Pennsylvania State University, has made a career of researching the origins of the evolution of skin color in humans. Their findings have illuminated our view of racial identity, but have also expanded our understanding of the role of vitamin D in human health. The doctor says Jablonski skin color regulates the amount of sunlight we admit in our body to produce vitamin D, which is essential for bone health, successful pregnancies and a strong immune system.
In ancient times, it has been found, skin color correlates with the amount of sunlight in areas where people live. People living in the tropics had darker skin, and the more temperate areas had lighter skin. For thousands of years humans spend most of their time out of doors, and remained in the geographical areas in which they were born.
Two things changed over time. First, people began to migrate to new areas of the world.
“You have people from England to Australia in motion. The people of West Africa moving to Finland You have this dramatic movement of people to environments that are poorly adapted from a solar perspective “.
second, because the world has changed, people began to spend more time indoors, away from sunlight.
In terms of health, these two trends have had the strongest effect on people with dark skin. Light-skinned people are able to adapt in sunny climates, applying sunscreen to prevent skin cancer (and destruction of folate) while still getting enough of the B vitamin D needed to produce ultraviolet radiation adds:
“Whether you are a person with dark pigmentation live in a place farther north or living in a city and not get sun exposure, however, then we are not addressing the problem of deficiency vitamin D is likely. ”
Lisa Bodnar who has a doctorate in nutrition and does research at the University of the Graduate School of Public Health, Pittsburgh, has found that pregnant women with vitamin D deficiencies are more likely to suffer of preeclampsia and have premature babies. She says that nearly half of African American mothers are deficient in vitamin D, compared to ten percent of white mothers.
A study in Cape Town, South Africa, has also been shown that among darker-skinned South Africans, the longer it goes on the inside, the lower the level of vitamin D and more weak immune system. Fortunately, vitamin D supplements can reverse this situation.