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Vitamin D status not predicted by surrogate markers, UB researchers find
Date:4/20/2010

BUFFALO, N.Y. -- Vitamin supplements, diet, geographic location, demographic information or lifestyle, independently or in combination, cannot accurately predict vitamin D concentrations in blood, researchers at the University at Buffalo have found.

This finding indicates that data such as vitamin D from foods and supplements or latitude of residence (northern vs. southern) cannot be used dependably as surrogate markers to assess the risk of breast and colon cancer.

Low blood levels of vitamin D have been associated with an increased risk of developing cancer, while high levels are considered potentially protective, making knowledge of a person's vitamin D status important.

Having a dependable way to obtain this information without drawing blood would eliminate the need for the invasive procedure, which some people find unpleasant, and could encourage more investigations on associations between vitamin D and disease risk.

However, results of the study conducted by UB epidemiologists show that such factors (e.g., age, vitamin D intake, supplement use, etc.), taken together, could explain only 21 percent of the variation in vitamin D levels between people.

These markers were particularly poor at identifying women with severe vitamin D deficiency or those with high levels, according to the findings.

Results of the study appear online ahead of print on the American Journal of Clinical Nutrition website.

"If we could predict someone's vitamin D status by asking them about their location of residence and their lifestyle, and combining that information with their demographic and medical characteristics, then research could be conducted on vitamin D status and disease even if we don't have blood samples from study participants," says Amy E. Millen, PhD, UB assistant professor of social and preventive medicine and first author on the study.

"Our analysis says we are not there yet. Other
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Contact: Lois Baker
ljbaker@buffalo.edu
716-645-4606
University at Buffalo
Source:Eurekalert

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