2014/03/5531e_fitness_default

Vitamin D hypothesis challenged: Some racial disparities in childbirth more environmental than genetic

A new study investigating racial disparities in birth outcomes shows that contrary to some theories Vitamin D is unlikely to play a role in differences in preterm birth and low birth weight between African-Americans and whites.

“For years there has been this hypothesis that African-Americans have worse birth outcomes because they have more melanin in their skin which reflects the sun and therefore lowers levels of Vitamin D,” said study author Zaneta Thayer, PhD, assistant professor of anthropology at the University of Colorado Denver. “But in examining the relationship between ultraviolet exposure and birth outcomes nationwide, there was no evidence to support this.”

The study was published in the American Journal of Epidemiology.

The so-called ultraviolet light or UVD theory holds that racial differences in health outcomes between blacks and whites are associated with the ability to synthesize Vitamin D from ultraviolet light. African-Americans, who have high concentrations of melanin, are less able to absorb Vitamin D from the sun leading some to believe that this contributes to higher rates of negative birth outcomes.

A lack of Vitamin D has been linked to increased risk of pregnancy complications, bone disorders, cardiovascular disease, diabetes and some cancers. At the same time, differences in socioeconomic status and racial discrimination have also been linked to low birth weights, risk of depression and other ailments.

Thayer collected data on UV exposure in 48 states or territories, using information compiled from the National Oceanic and Atmospheric Administration (NOAA) National Weather Service website. She also used birth outcome data came from the National Centers for Disease Control and Prevention, focusing specifically on incidents of low birth weight and preterm births.

The study found that states with the highest income inequalities had higher disparities in birth outcomes across the UV spectrum.

The racial disparity in low birth weight was greatest among women living in areas with high UV exposure and greater income inequality. The disparity in preterm births was also highest in areas with increased UV exposure and income inequality.

According to the UVD hypothesis, the difference in birth outcomes between whites and blacks should be lower among women in areas with more sunshine or UV radiation. In fact, there was an increase in disparities in those areas.

“Given the UV hypothesis, we would expect that women who live in the South would have better birth outcomes than those living in the North,” Thayer said. “However, the present analysis suggests the exact opposite, with both absolute rates as well as racial disparities in adverse birth outcomes being greatest in southern states.”

In fact, the states with the lowest disparities in preterm and low birth weights were North Dakota and Vermont which had the second and third lowest UV Indexes respectively.

“The results suggest that the environment is a stronger contributor to adverse birth outcomes than genes, since there

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Three young fitness stars we’re sure to see more of in 2014 – Justin, 21, the complete package; Josh L, 20, incredible density and condition; and Josh A, 20,…
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Comments

    • trilla dilla
    • March 14, 2014
    Reply

    Dayum how do I get like this Ima skinny nigga

    View Comment
    • Lion Heart
    • March 14, 2014
    Reply

    Whats is the difference between a fitness model and bodybuilder?

    View Comment
    • MrEast111
    • March 14, 2014
    Reply

    That last guy looked pathetic! If it’s this easy to compete and win, fuck I
    know I could beat them all. Maybe not to the lvl of the first guy though.

    View Comment
    • MrReincarnationSheep
    • March 14, 2014
    Reply

    josh might not be big as fuk but i promise 9 of 10 girls would prefer his
    physique over the other 3.

    View Comment
    • burak saibot
    • March 14, 2014
    Reply

    josh has %100 ectomorph body 

    View Comment
    • kioyix2
    • March 14, 2014
    Reply

    who pays for their bodys? i am not like them cuz i have no money :c 

    View Comment
    • Austin Wilder
    • March 14, 2014
    Reply

    0:38 thought he was fondling that dude’s junk

    View Comment
    • Misho Amoli
    • March 14, 2014
    Reply

    The last one?

    View Comment
    • roughavoc
    • March 14, 2014
    Reply

    Big up to my cousin for this!

    View Comment
    • Arteisgoodman
    • March 14, 2014
    Reply

    and they are not guys no one 100 ;-)

    View Comment
    • Anas Chivalrous
    • March 14, 2014
    Reply

    Amazing 

    View Comment
    • Arteisgoodman
    • March 14, 2014
    Reply

    he is natural 100 ;-)

    View Comment
    • MrGlobalTelevision
    • March 15, 2014
    Reply

    Third guy no legs

    View Comment
    • David Diego
    • March 15, 2014
    Reply

    +trilla dilla Strict dieting, Gear, lifting. 

    View Comment
    • PeekaPeep
    • March 15, 2014
    Reply

    Justin has one of the best physiques around for someone in that age group.
    Damn, I mean he looks like a freakin’ Terminator! If I decided to hit the
    gym for real, THAT’S who I want to emulate to the best of my ability.

    View Comment
    • Алексей Таразанов
    • March 15, 2014
    Reply

    girls!!!

    View Comment
    • AbsoluteyAmerican
    • March 15, 2014
    Reply

    What are we determining as fitness stars? I would say Dmitry Klokov, Donny
    Shankle, Kendric Farris, are fitness stars before any of these people. 

    View Comment
    • Wally Pujllay
    • March 15, 2014
    Reply

    Justin :)

    View Comment
    • Antonio Leitão
    • March 15, 2014
    Reply

    Yes i like this

    View Comment
    • Ageless Bodybuilding
    • March 15, 2014
    Reply

    Q: can they look this good at age 50+ ?

    View Comment
    • vicci reyes
    • March 15, 2014
    Reply

    Last guy was small but fuarrk he has some massive aesthetics on him

    View Comment

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