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Misconceptions - vitamin D insufficiency causes malabsorption of calcium
Allan G Need1, B E Christopher Nordin
1The Division of Clinical Biochemistry, Institute of Medical and Veterinary Science, the Department of Medicine, University of Adelaide and the Hanson Institute, Adelaide, South Australia 5000, Australia. allan.need@imvs.sa.gov.au
Bone
|March 18, 2008
Summary
Vitamin D insufficiency directly harms bone health in the elderly, independent of calcium absorption. Low levels of 25 hydroxyvitamin D negatively impact bone, refuting common assumptions.
Area of Science:
- Bone metabolism and endocrinology.
- Geriatric medicine and skeletal health.
Background:
- Vitamin D insufficiency is a prevalent issue in the elderly population.
- The established link between vitamin D and bone health primarily focuses on calcium absorption.
- Evidence supporting this calcium-centric view is limited.
Purpose of the Study:
- To investigate the direct impact of vitamin D insufficiency on bone health in the elderly.
- To challenge the prevailing assumption that vitamin D's negative skeletal effects are solely due to reduced calcium absorption.
Main Methods:
- Analysis of two previously published patient cohorts comprising elderly individuals.
- Assessment of circulating 25 hydroxyvitamin D levels.
- Evaluation of bone health parameters in relation to vitamin D status.
Main Results:
- Low circulating levels of 25 hydroxyvitamin D were observed.
- A direct, detrimental effect of low 25 hydroxyvitamin D on bone was identified.
- This effect was independent of calcium absorption mechanisms.
Conclusions:
- Vitamin D insufficiency has a direct negative impact on bone health in the elderly.
- The common attribution to decreased calcium absorption is not supported by this evidence.
- Low 25 hydroxyvitamin D levels represent a significant risk factor for skeletal deterioration in older adults.
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