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Vitamin k status in nutritionally compromised circumstances

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Mina Yamazaki Price, Victor R. Preedy

Original languageEnglish
Title of host publicationHandbook of Famine, Starvation, and Nutrient Deprivation
Subtitle of host publicationFrom Biology to Policy
PublisherSpringer International Publishing Switzerland
Number of pages16
ISBN (Electronic)9783319553870
ISBN (Print)9783319553863
Published6 Mar 2019

King's Authors


Vitamin K deficiency is very rare except in neonatal populations. This is due to dietary sources, particularly plant-derived phylloquinones (vitamin K1) being abundantly distributed in nature and ubiquitously available in common foods. However, there is very little information on the bioavailability of vitamin K from foods. Furthermore, despite the increased understanding of vitamin K's biological roles, there are difficulties in establishing a causal link between plausible biomarkers of vitamin K deficiency and reproducible health outcome measures. Additionally, with vitamin K there is the added complication that this vitamin is also synthesized in the gastrointestinal tract by gut microflora. As a result, the exact dietary requirements for vitamin K in numerical terms have not been fully established. Clinically significant vitamin K deficiency is almost nonexistence in healthy populations. However, there are states in which it is compromised in some population cohorts other than neonatal populations. This review illustrates some examples of vitamin K insufficiency states, which include eating disorders, undernourished children, inflammatory bowel disease, and chronic kidney disease. It also describes some biomarkers of vitamin K status used in recent studies.

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