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Two studies in the Journal of Clinical Endocrinology and Metabolism focus on vitamin D in older populations.
Researchers measured serum 25-hydroxyvitamin D (25[OH]D) in 6000 community-dwelling men (age range, 65–99) who lived in various U.S. regions. Average serum 25(OH)D level was 25 ng/mL; one quarter of subjects had levels lower than 20 ng/mL. In multivariable analysis, lower 25(OH)D levels were associated with older age, obesity, black or Latino ethnicity, blood sampling in winter, and residence at a northern latitude (e.g., Minneapolis, compared with San Diego). Use of vitamin D supplements and engaging in outdoor activities were associated with higher vitamin D levels.
Dutch researchers examined relations between vitamin D levels and bo…