Studies in adults and children have shown a link between obesity and vitamin D deficiency. However, data characterizing the racial differences in the relationship between obesity and vitamin D, particularly in fat tissue distribution are limited. This study examined the racial differences in the relationship between vitamin D status, BMI, fat levels, fat distribution and lipid levels in healthy obese and non-obese 8-18 year old black and white children.

“Vitamin D deficiency is rampant in American youth, and there is some suggestion in adults that low levels of vitamin D may be playing a role in the increasing rates of type 2 diabetes. It is possible the same may be true for youth with type 2 diabetes,” said Silva Arslanian, MD, of the University of Pittsburgh and lead author of the study. “Our study found that vitamin D was associated with higher fat levels and lower levels of high-density lipoprotein (HDL), also known as good cholesterol, in both black and white children.”

In this study, researchers measured vitamin D levels in 237 children and found the majority of the study participants were vitamin D deficient. Plasma vitamin D levels were associated inversely with BMI and fat levels and positively with HDL cholesterol in all subjects. Visceral adipose tissue (fat between internal organs) was higher in vitamin D deficient whites and subcutaneous adipose tissue (fat below the skin) was higher in vitamin D deficient blacks compared with their respective vitamin D non-deficient counterparts.

“Besides therapeutic interventions to correct the high rates of vitamin D deficiency in youth, benefits of vitamin D optimization on fat levels, lipid profile and risk of type 2 diabetes need to be explored,” said Arslanian.

Other researchers working on the study include: Kumaravel Rajakumar, Javier de las Heras and SoJung Lee of the University of Pittsburgh in Penn.; and Tai Chen and Michael Holick of Boston University in Mass.

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Journal Reference:

1. L. George, F. Bacha, S. Lee, H. Tfayli, E. Andreatta, S. Arslanian. Surrogate Estimates of Insulin Sensitivity in Obese Youth Along the Spectrum of Glucose Tolerance from Normal to Prediabetes to Diabetes. Journal of Clinical Endocrinology & Metabolism, 2011; DOI: 10.1210/jc.2010-2813

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Although vitamin C & zinc have historically received most of the press regarding their ability to help resist cold and flu, Vitamin D is the big winner here.  In fact recent studies have shown that people with the lowest vitamin D levels are often the most susceptible to colds and flu.

“The findings of our study support an important role for vitamin D in prevention of common respiratory infections, such as colds and the flu,” says researcher Adit Ginde, MD, MPH, of the University of Colorado, Denver, Division of Emergency Medicine, in a news release. “Individuals with common lung diseases, such as asthma or emphysema, may be particularly susceptible to respiratory infections from vitamin D deficiency.”

“We are planning clinical trials to test the effectiveness of vitamin D to boost immunity and fight respiratory infection, with a focus on individuals with asthma and COPD, as well as children and older adults — groups that are at higher risk for more severe illness,” Ginde says. “While it’s too early to make any definitive recommendations, many Americans also need more vitamin D for its bone and general health benefits.”

A group of scientists from UCLA published a remarkable paper in the prestigious journal, Nature. The UCLA group confirmed two other recent studies, showing that a naturally occurring steroid hormone – a hormone most of us take for granted – was, in effect, a potent antibiotic. Instead of directly killing bacteria and viruses, the steroid hormone under question increases the body’s production of a remarkable class of proteins, called antimicrobial peptides. The 200 known antimicrobial peptides directly and rapidly destroy the cell walls of bacteria, fungi, and viruses, including the influenza virus, and play a key role in keeping the lungs free of infection. The steroid hormone that showed these remarkable antibiotic properties was plain old vitamin D.

A few years ago, I became convinced that vitamin D was unique in the vitamin world by virtue of three facts. First, it’s the only known precursor of a potent steroid hormone, calcitriol, or activated vitamin D. Most other vitamins are antioxidants or co-factors in enzyme reactions. Activated vitamin D – like all steroid hormones – damasks the genome, turning protein production on and off, as your body requires. That is, vitamin D regulates genetic expression in hundreds of tissues throughout your body. This means it has as many potential mechanisms of action as genes it damasks.

Second, vitamin D does not exist in appreciable quantities in normal human diets. True, you can get several thousand units in a day if you feast on sardines for breakfast, herring for lunch and salmon for dinner. The only people who ever regularly consumed that much fish are peoples, like the Inuit, who live at the extremes of latitude. The milk Americans depend on for their vitamin D contains no naturally occurring vitamin D; instead, the U.S. government requires fortified milk to be supplemented with vitamin D, but only with what we now know to be a paltry 100 units per eight-ounce glass.

The vitamin D steroid hormone system has always had its origins in the skin, not in the mouth. Until quite recently, when dermatologists and governments began warning us about the dangers of sunlight, humans made enormous quantities of vitamin D where humans have always made it, where naked skin meets the ultraviolet B radiation of sunlight. We just cannot get adequate amounts of vitamin D from our diet. If we don’t expose ourselves to ultraviolet light, we must get vitamin D from dietary supplements.

The third way vitamin D is different from other vitamins is the dramatic difference between natural vitamin D nutrition and the modern one. Today, most humans only make about a thousand units of vitamin D a day from sun exposure; many people, such as the elderly or African Americans, make much less than that. How much did humans normally make? A single, twenty-minute, full body exposure to summer sun will trigger the delivery of 20,000 units of vitamin D into the circulation of most people within 48 hours. Twenty thousand units, that’s the single most important fact about vitamin D. Compare that to the 100 units you get from a glass of milk, or the several hundred daily units the U.S. government recommend as “Adequate Intake.” It’s what we call an “order of magnitude” difference.

Our advice – get tested to check vitamin D levels in your body.  Take vitamin D supplements derived from natural sources.  Last and certainly not least, get 20/40 minuits of exposure to sunlight daily.  For more information Click Here about vitamin D supplementation.

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