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High dietary Vitamin K linked to superior bone properties (density & elasticity) and preservation in older men & women – Source: Bone, Apr 4, 2011

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www.ProHealth.com • April 13, 2011


Abstract Title:
Dietary vitamin K intake is associated with bone quantitative ultrasound measurements but not with bone peripheral biochemical markers in elderly men and women – Source: Bone, Apr 4, 2011

by Monica Bullo, et al.

Background: Vitamin K may have a protective role against bone loss and osteoporotic fractures associated with aging, although data in humans are inconsistent and the mechanisms involved are still unknown.

• The main objective of the study was to assess the associations between vitamin K intake, bone density, bone structure quality and biochemical bone metabolism markers in elderly subjects. [Note: As people age, destruction tends to overwhelm bone building in the bone ‘turnover’ process.]

• We also analyzed the relationship between changes in vitamin K intake and the evolution of bone quality markers after two years of follow-up.

Methods: Cross-sectional analysis was carried out on 365 elderly subjects, 200 of whom were also included in a 2-year longitudinal follow-up study.

Usual dietary intakes were assessed using a semi-quantitative 137-item food frequency questionnaire (FFQ). Vitamin K intake was estimated using the USDA database. Bone biochemical markers were measured in a subset of 125 subjects.

Quantitative ultrasound assessment (QUS) was performed at the calcaneus to estimate bone mineral density (BMD), speed of sound (SOS), broadband ultrasound attenuation (BUA) and the quantitative ultrasound index (QUI).

Results:

Dietary intake of vitamin K was significantly associated with higher BMD and better QUS. No significant associations were found between vitamin K intake and bone biochemical markers.

Those subjects who increased their vitamin K intake showed a lower loss of bone mineral density, a lower decrease in SOS, and a nonsignificant increase in BUA.

Conclusions:


• High dietary vitamin K intake was associated with superior bone properties.

• Moreover, an increase in dietary vitamin K was significantly related to lower losses of bone mineral density and smaller increases in the porosity and elasticity attributed to aging,

• Which helps to explain the previously described protective effect of vitamin K intake against osteoporotic fractures.

Source: Bone, Apr 4, 2011. PMID: 21447413, by Bulló M, Estruch R, Salas-Salvadó J. Human Nutrition Unit, Faculty of Medicine and Health Sciences, Universitat Rovira i Virgili, Reus, Spain; CIBERobn Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain. [Email: monica.bullo@urv.cat]

[Note: For more information, see “Vitamin K-2: A Key Player in Cardiovascular and Bone Health.”]





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