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Advances in health and medicine.
Marjorie Bekaert Thomas
Advances in health and medicine.
Nutrition & Wellness Channel
Reported November 6, 2012

Low Vitamin D Levels=Longevity?


(Ivanhoe Newswire) -- Vitamin D is used for conditions of the heart and blood vessels, including high blood pressure and high cholesterol. It is also used for diabetes, obesity, muscle weakness, multiple sclerosis, rheumatoid arthritis, chronic obstructive pulmonary disease (COPD), asthma, bronchitis, premenstrual syndrome (PMS), and tooth and gum disease. Researchers are now linking Vitamin D levels to longevity.
To determine whether there was an association between vitamin D levels and longevity, Dutch researchers looked at data from 380 white families with at least 2 siblings over age 90 (89 years or older for men and 91 year or older for women) in the Leiden Longevity Study. The study involved the siblings, their offspring and their offsprings' partners for a total of 1038 offspring and 461 controls. The children of the nonagenarians were included because it is difficult to include controls for the older age group. The partners were included because they were of a similar age and shared similar environmental factors that might influence vitamin D levels.
The researchers measured levels of 25(OH) vitamin D and categorized levels by month as they varied according to season. Tanning bed use, which can affect vitamin D levels, was categorized as never, 1 times per year and 6 times per year. The researchers controlled for age, sex, BMI (body mass index), time of year, vitamin supplementation and kidney function, all factors that can influence vitamin D levels. They also looked at the influence of genetic variation in 3 genes associated with vitamin D levels.
"We found that the offspring of nonagenarians who had at least 1 nonagenarian sibling had lower levels of vitamin D than controls, independent of possible confounding factors and SNPs [single nucleotide polymorphisms] associated with vitamin D levels," Dr. Diana van Heemst, Department of Gerontology and Geriatrics was quoted saying. 
"We also found that the offspring had a lower frequency of common genetic variants in the CYP2R1 gene; a common genetic variant of this gene predisposes people to high vitamin D levels. These findings support an association between low vitamin D levels and familial longevity," Heemst continued.
The findings postulate that offspring of nonagenarians might have more of a protein that is hypothesized to be an "aging suppressor" protein. More research is needed to understand the link between lower vitamin D levels, genetic variants and familial longevity.
Source: Canadian Medical Association Journal, November 2012
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