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CHEVY CHASE, Md. — Vitamin D-deficient older individuals are more likely to struggle with everyday tasks such as dressing or climbing stairs, according to a recent study accepted for publication in the Endocrine Society's Journal of Clinical Endocrinology & Metabolism.
"Seniors who have low levels of vitamin D are more likely to have mobility limitations and to see their physical functioning decline over time," stated the study's lead author, Evelien Sohl, of VU University Medical Center in Amsterdam, the Netherlands. "Older individuals with these limitations are more likely to be admitted to nursing homes and face a higher risk of mortality."
Scientists estimate as many as 90% of older individuals are vitamin D deficient. Vitamin D deficiency can lead to a decline in bone density, muscle weakness, osteoporosis or broken bones.
Using data from an ongoing Dutch cohort study (The Longitudinal Aging Study: Amsterdam), the researchers examined among two groups — 762 people between the ages of 65 and 88, and 597 people between the ages of 55 and 65 — over the course of six years. Using blood test results, the subjects were split into groups with the highest, moderate and lowest vitamin D levels. To assess mobility limitations, participants were asked about their ability to perform routine tasks, including sitting down and standing up from a chair or walking outside for five minutes without resting.
Among the older group of participants, people with the lowest vitamin D levels were 1.7 times more likely to have at least one functional limitation compared to those with the highest vitamin D levels. In the younger cohort, individuals with low vitamin D levels were twice as likely to have at least one physical limitation.
While the majority of the people in the older cohort's top two vitamin D groups did not report any physical limitations, 70% of the people with the lowest vitamin D levels had at least one limitation.
In addition, the study found vitamin D-deficient individuals were more likely to develop additional limitations over time. The older cohort reported more mobility issues after three years, while the younger cohort developed additional limitations over the course of six years.
"The findings indicate low vitamin D levels in older individuals may contribute to the declining ability to perform daily activities and live independently," Sohl said. "Vitamin D supplementation could provide a way to prevent physical decline, but the idea needs to be explored further with additional studies."
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