Vitamin K intake and hip fractures in women: A prospective study

Diane Feskanich, Peter Weber, Walter C. Willett, Helaine Rockett, Sarah L. Booth, Graham A. Colditz

Research output: Contribution to journalArticlepeer-review

361 Scopus citations

Abstract

Background: Vitamin K mediates the γ-carboxylation of glutamyl residues on several bone proteins, notably osteocalcin. High serum concentrations of undercarboxylated osteocalcin and low serum concentrations of vitamin K are associated with lower bone mineral density and increased risk of hip fracture. However, data are limited on the effects of dietary vitamin K. Objective: We investigated the hypothesis that high intakes of vitamin K are associated with a lower risk of hip fracture in women. Design: We conducted a prospective analysis within the Nurses' Health Study cohort. Diet was assessed in 72327 women aged 38-63 y with a food-frequency questionnaire in 1984 (baseline). During the subsequent 10 y of follow-up, 270 hip fractures resulting from low or moderate trauma were reported. Results: Women in quintiles 2-5 of vitamin K intake had a significantly lower age-adjusted relative risk (RR: 0.70; 95% CI: 0.53, 0.93) of hip fracture than women in the lowest quintile (< 109 μg/d). Risk did not decrease between quintiles 2 and 5 and risk estimates were not altered when other risk factors for osteoporosis, including calcium and vitamin D intakes, were added to the models. Risk of hip fracture was also inversely associated with lettuce consumption (RR: 0.55; 95% CI: 0.40, 0.78) for one or more servings per day compared with one or fewer servings per week), the food that contributed the most to dietary vitamin K intakes. Conclusions: Low intakes of vitamin K may increase the risk of hip fracture in women. The data support the suggestion for a reassessment of the vitamin K requirements that are based on bone health and blood coagulation.

Original languageEnglish
Pages (from-to)74-79
Number of pages6
JournalAmerican Journal of Clinical Nutrition
Volume69
Issue number1
DOIs
StatePublished - Jan 1999

Keywords

  • Bone
  • Diet
  • Fractures
  • Hips
  • Nurses' Health Study
  • Osteoporosis
  • Phylloquinone
  • Undercarboxylated osteocalcin
  • Vitamin K
  • Women

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